1981/01/01	15.50
1981/01/02	15.50
1981/01/03	15.50
1981/01/04	15.00
1981/01/05	15.00
1981/01/06	15.00
1981/01/07	15.00
1981/01/08	15.00
1981/01/09	14.50
1981/01/10	14.50
1981/01/11	14.50
1981/01/12	14.50
1981/01/13	14.00
1981/01/14	14.00
1981/01/15	14.00
1981/01/16	14.00
1981/01/17	14.00
1981/01/18	14.00
1981/01/19	14.00
1981/01/20	14.00
1981/01/21	14.00
1981/01/22	14.00
1981/01/23	14.00
1981/01/24	13.50
1981/01/25	13.50
1981/01/26	13.50
1981/01/27	13.50
1981/01/28	13.50
1981/01/29	13.50
1981/01/30	13.50
1981/01/31	13.50
1981/02/01	13.50
1981/02/02	13.50
1981/02/03	13.50
1981/02/04	13.50
1981/02/05	13.50
1981/02/06	13.00
1981/02/07	13.00
1981/02/08	13.00
1981/02/09	13.00
1981/02/10	13.00
1981/02/11	12.50
1981/02/12	12.50
1981/02/13	12.50
1981/02/14	12.50
1981/02/15	12.50
1981/02/16	13.50
1981/02/17	13.50
1981/02/18	13.50
1981/02/19	13.50
1981/02/20	13.50
1981/02/21	13.50
1981/02/22	14.00
1981/02/23	13.50
1981/02/24	13.50
1981/02/25	13.00
1981/02/26	13.00
1981/02/27	13.00
1981/02/28	12.50
1981/03/01	12.00
1981/03/02	11.50
1981/03/03	11.50
1981/03/04	11.00
1981/03/05	10.50
1981/03/06	10.50
1981/03/07	10.50
1981/03/08	10.50
1981/03/09	10.50
1981/03/10	10.50
1981/03/11	11.00
1981/03/12	11.00
1981/03/13	11.00
1981/03/14	11.00
1981/03/15	11.00
1981/03/16	11.00
1981/03/17	11.00
1981/03/18	11.00
1981/03/19	11.00
1981/03/20	11.00
1981/03/21	11.00
1981/03/22	11.00
1981/03/23	10.50
1981/03/24	10.50
1981/03/25	10.50
1981/03/26	10.50
1981/03/27	10.50
1981/03/28	10.50
1981/03/29	10.00
1981/03/30	10.00
1981/03/31	10.00
1981/04/01	11.80
1981/04/02	13.00
1981/04/03	11.80
1981/04/04	10.60
1981/04/05	10.60
1981/04/06	10.60
1981/04/07	10.60
1981/04/08	10.60
1981/04/09	10.60
1981/04/10	10.60
1981/04/11	10.60
1981/04/12	12.40
1981/04/13	11.20
1981/04/14	14.20
1981/04/15	17.20
1981/04/16	13.60
1981/04/17	10.60
1981/04/18	12.40
1981/04/19	13.00
1981/04/20	11.20
1981/04/21	10.00
1981/04/22	11.80
1981/04/23	13.00
1981/04/24	10.60
1981/04/25	10.60
1981/04/26	12.40
1981/04/27	20.80
1981/04/28	13.60
1981/04/29	11.20
1981/04/30	10.00
1981/05/01	10.00
1981/05/02	10.60
1981/05/03	10.60
1981/05/04	11.80
1981/05/05	24.40
1981/05/06	19.00
1981/05/07	13.60
1981/05/08	11.80
1981/05/09	11.20
1981/05/10	25.00
1981/05/11	17.20
1981/05/12	13.60
1981/05/13	11.80
1981/05/14	11.80
1981/05/15	11.20
1981/05/16	13.60
1981/05/17	26.20
1981/05/18	23.20
1981/05/19	17.20
1981/05/20	14.80
1981/05/21	14.20
1981/05/22	18.40
1981/05/23	25.60
1981/05/24	26.80
1981/05/25	33.40
1981/05/26	32.80
1981/05/27	43.00
1981/05/28	23.20
1981/05/29	79.00
1981/05/30	47.20
1981/05/31	28.60
1981/06/01	22.00
1981/06/02	25.60
1981/06/03	26.80
1981/06/04	23.80
1981/06/05	22.60
1981/06/06	19.00
1981/06/07	17.20
1981/06/08	17.20
1981/06/09	16.60
1981/06/10	16.60
1981/06/11	16.60
1981/06/12	14.80
1981/06/13	16.00
1981/06/14	16.00
1981/06/15	16.00
1981/06/16	22.60
1981/06/17	19.00
1981/06/18	25.00
1981/06/19	23.80
1981/06/20	58.00
1981/06/21	55.60
1981/06/22	44.20
1981/06/23	69.90
1981/06/24	119.00
1981/06/25	139.80
1981/06/26	163.80
1981/06/27	89.50
1981/06/28	59.40
1981/06/29	51.40
1981/06/30	42.40
1981/07/01	40.00
1981/07/02	34.60
1981/07/03	31.60
1981/07/04	59.40
1981/07/05	1350.00
1981/07/06	-9999
1981/07/07	-9999
1981/07/08	1222.10
1981/07/09	884.60
1981/07/10	610.20
1981/07/11	444.50
1981/07/12	361.30
1981/07/13	283.00
1981/07/14	241.40
1981/07/15	207.80
1981/07/16	202.60
1981/07/17	183.10
1981/07/18	382.80
1981/07/19	342.80
1981/07/20	277.00
1981/07/21	235.80
1981/07/22	261.00
1981/07/23	202.60
1981/07/24	214.30
1981/07/25	227.40
1981/07/26	190.90
1981/07/27	193.50
1981/07/28	183.10
1981/07/29	207.80
1981/07/30	289.00
1981/07/31	284.50
1981/08/01	252.60
1981/08/02	237.20
1981/08/03	215.60
1981/08/04	312.40
1981/08/05	617.10
1981/08/06	351.10
1981/08/07	293.50
1981/08/08	252.60
1981/08/09	223.40
1981/08/10	202.60
1981/08/11	237.20
1981/08/12	222.10
1981/08/13	200.00
1981/08/14	180.50
1981/08/15	194.80
1981/08/16	187.00
1981/08/17	169.28
1981/08/18	161.02
1981/08/19	280.00
1981/08/20	304.40
1981/08/21	228.80
1981/08/22	193.50
1981/08/23	172.82
1981/08/24	162.20
1981/08/25	151.58
1981/08/26	142.14
1981/08/27	161.02
1981/08/28	180.50
1981/08/29	163.38
1981/08/30	140.96
1981/08/31	216.90
1981/09/01	274.00
1981/09/02	261.00
1981/09/03	251.20
1981/09/04	377.40
1981/09/05	286.00
1981/09/06	325.20
1981/09/07	390.00
1981/09/08	296.50
1981/09/09	234.40
1981/09/10	213.00
1981/09/11	184.40
1981/09/12	163.38
1981/09/13	148.04
1981/09/14	135.06
1981/09/15	122.08
1981/09/16	125.62
1981/09/17	110.60
1981/09/18	101.80
1981/09/19	99.60
1981/09/20	100.70
1981/09/21	88.00
1981/09/22	81.00
1981/09/23	81.00
1981/09/24	74.00
1981/09/25	72.10
1981/09/26	68.50
1981/09/27	75.00
1981/09/28	69.40
1981/09/29	69.40
1981/09/30	66.70
1981/10/01	59.50
1981/10/02	57.70
1981/10/03	67.60
1981/10/04	63.10
1981/10/05	120.90
1981/10/06	166.92
1981/10/07	106.20
1981/10/08	110.60
1981/10/09	104.00
1981/10/10	96.30
1981/10/11	88.00
1981/10/12	87.00
1981/10/13	74.00
1981/10/14	73.00
1981/10/15	64.90
1981/10/16	62.20
1981/10/17	99.60
1981/10/18	123.26
1981/10/19	105.10
1981/10/20	82.00
1981/10/21	75.00
1981/10/22	66.70
1981/10/23	69.40
1981/10/24	67.60
1981/10/25	63.10
1981/10/26	62.20
1981/10/27	59.50
1981/10/28	55.90
1981/10/29	52.30
1981/10/30	51.40
1981/10/31	49.60
1981/11/01	47.80
1981/11/02	46.00
1981/11/03	45.10
1981/11/04	43.30
1981/11/05	46.00
1981/11/06	41.50
1981/11/07	40.60
1981/11/08	38.80
1981/11/09	37.90
1981/11/10	36.20
1981/11/11	35.40
1981/11/12	35.40
1981/11/13	34.60
1981/11/14	34.60
1981/11/15	34.60
1981/11/16	33.00
1981/11/17	33.00
1981/11/18	45.10
1981/11/19	39.70
1981/11/20	33.80
1981/11/21	32.20
1981/11/22	31.40
1981/11/23	30.60
1981/11/24	30.60
1981/11/25	29.80
1981/11/26	29.00
1981/11/27	29.00
1981/11/28	28.20
1981/11/29	27.40
1981/11/30	26.60
1981/12/01	25.80
1981/12/02	25.00
1981/12/03	25.00
1981/12/04	25.00
1981/12/05	25.00
1981/12/06	24.20
1981/12/07	24.20
1981/12/08	23.40
1981/12/09	23.40
1981/12/10	23.40
1981/12/11	23.40
1981/12/12	22.60
1981/12/13	22.60
1981/12/14	22.60
1981/12/15	22.60
1981/12/16	22.60
1981/12/17	22.60
1981/12/18	21.80
1981/12/19	21.00
1981/12/20	20.30
1981/12/21	20.30
1981/12/22	20.30
1981/12/23	19.60
1981/12/24	19.60
1981/12/25	19.60
1981/12/26	19.60
1981/12/27	18.90
1981/12/28	18.90
1981/12/29	18.90
1981/12/30	18.20
1981/12/31	18.20
#===========================================
# Number of observations = 363 / 365
# Average = 80.71