1981/01/01	24.95
1981/01/02	24.95
1981/01/03	24.95
1981/01/04	24.95
1981/01/05	24.60
1981/01/06	24.25
1981/01/07	24.25
1981/01/08	23.90
1981/01/09	23.90
1981/01/10	23.55
1981/01/11	23.55
1981/01/12	23.55
1981/01/13	23.20
1981/01/14	22.50
1981/01/15	22.50
1981/01/16	22.85
1981/01/17	22.85
1981/01/18	22.15
1981/01/19	22.15
1981/01/20	22.15
1981/01/21	21.45
1981/01/22	20.75
1981/01/23	20.75
1981/01/24	20.75
1981/01/25	20.75
1981/01/26	21.10
1981/01/27	21.10
1981/01/28	20.75
1981/01/29	20.75
1981/01/30	20.75
1981/01/31	20.40
1981/02/01	20.75
1981/02/02	20.75
1981/02/03	20.40
1981/02/04	20.05
1981/02/05	19.70
1981/02/06	19.35
1981/02/07	19.70
1981/02/08	20.05
1981/02/09	19.70
1981/02/10	19.70
1981/02/11	19.70
1981/02/12	19.70
1981/02/13	19.70
1981/02/14	19.70
1981/02/15	19.35
1981/02/16	19.35
1981/02/17	19.00
1981/02/18	18.30
1981/02/19	18.65
1981/02/20	19.00
1981/02/21	19.00
1981/02/22	18.30
1981/02/23	18.30
1981/02/24	16.55
1981/02/25	14.60
1981/02/26	14.90
1981/02/27	14.90
1981/02/28	14.60
1981/03/01	14.00
1981/03/02	13.70
1981/03/03	13.70
1981/03/04	13.70
1981/03/05	13.70
1981/03/06	13.70
1981/03/07	13.70
1981/03/08	13.70
1981/03/09	13.40
1981/03/10	13.40
1981/03/11	13.70
1981/03/12	14.30
1981/03/13	14.30
1981/03/14	14.60
1981/03/15	14.60
1981/03/16	14.30
1981/03/17	13.70
1981/03/18	13.40
1981/03/19	14.60
1981/03/20	12.50
1981/03/21	12.25
1981/03/22	12.25
1981/03/23	11.75
1981/03/24	11.50
1981/03/25	11.25
1981/03/26	11.25
1981/03/27	11.25
1981/03/28	11.25
1981/03/29	11.25
1981/03/30	11.00
1981/03/31	11.00
1981/04/01	11.00
1981/04/02	11.50
1981/04/03	12.00
1981/04/04	12.25
1981/04/05	13.10
1981/04/06	15.20
1981/04/07	15.20
1981/04/08	13.70
1981/04/09	12.80
1981/04/10	12.50
1981/04/11	12.25
1981/04/12	12.00
1981/04/13	12.80
1981/04/14	21.10
1981/04/15	25.30
1981/04/16	26.00
1981/04/17	29.20
1981/04/18	26.00
1981/04/19	21.10
1981/04/20	18.30
1981/04/21	17.95
1981/04/22	15.50
1981/04/23	14.30
1981/04/24	13.70
1981/04/25	15.50
1981/04/26	14.60
1981/04/27	14.00
1981/04/28	15.50
1981/04/29	14.60
1981/04/30	14.00
1981/05/01	13.70
1981/05/02	13.10
1981/05/03	12.80
1981/05/04	16.55
1981/05/05	19.70
1981/05/06	18.30
1981/05/07	21.80
1981/05/08	32.40
1981/05/09	28.80
1981/05/10	22.50
1981/05/11	21.80
1981/05/12	22.85
1981/05/13	19.35
1981/05/14	16.90
1981/05/15	15.50
1981/05/16	14.90
1981/05/17	15.85
1981/05/18	18.65
1981/05/19	37.60
1981/05/20	57.00
1981/05/21	48.00
1981/05/22	50.50
1981/05/23	56.50
1981/05/24	73.50
1981/05/25	62.00
1981/05/26	50.00
1981/05/27	42.80
1981/05/28	40.00
1981/05/29	44.40
1981/05/30	51.50
1981/05/31	46.80
1981/06/01	39.20
1981/06/02	34.00
1981/06/03	34.00
1981/06/04	40.00
1981/06/05	41.60
1981/06/06	40.00
1981/06/07	35.20
1981/06/08	30.80
1981/06/09	28.80
1981/06/10	30.40
1981/06/11	29.60
1981/06/12	27.20
1981/06/13	25.65
1981/06/14	26.00
1981/06/15	30.40
1981/06/16	29.60
1981/06/17	26.40
1981/06/18	23.90
1981/06/19	24.25
1981/06/20	26.00
1981/06/21	30.80
1981/06/22	32.40
1981/06/23	47.60
1981/06/24	63.00
1981/06/25	69.00
1981/06/26	79.40
1981/06/27	85.45
1981/06/28	84.90
1981/06/29	75.00
1981/06/30	60.50
1981/07/01	47.20
1981/07/02	39.20
1981/07/03	33.60
1981/07/04	29.60
1981/07/05	26.80
1981/07/06	31.60
1981/07/07	117.80
1981/07/08	217.80
1981/07/09	240.70
1981/07/10	200.20
1981/07/11	178.20
1981/07/12	174.00
1981/07/13	153.50
1981/07/14	131.60
1981/07/15	105.80
1981/07/16	79.95
1981/07/17	74.00
1981/07/18	76.10
1981/07/19	74.00
1981/07/20	98.60
1981/07/21	197.80
1981/07/22	249.70
1981/07/23	242.50
1981/07/24	228.20
1981/07/25	228.20
1981/07/26	241.60
1981/07/27	229.90
1981/07/28	229.00
1981/07/29	223.40
1981/07/30	209.80
1981/07/31	205.00
1981/08/01	187.40
1981/08/02	171.20
1981/08/03	189.00
1981/08/04	185.80
1981/08/05	193.00
1981/08/06	229.00
1981/08/07	252.40
1981/08/08	282.10
1981/08/09	325.20
1981/08/10	312.00
1981/08/11	283.90
1981/08/12	270.40
1981/08/13	265.90
1981/08/14	282.10
1981/08/15	283.00
1981/08/16	256.00
1981/08/17	215.40
1981/08/18	170.50
1981/08/19	150.25
1981/08/20	132.20
1981/08/21	128.60
1981/08/22	121.40
1981/08/23	108.80
1981/08/24	99.80
1981/08/25	90.80
1981/08/26	83.25
1981/08/27	77.20
1981/08/28	75.00
1981/08/29	78.30
1981/08/30	73.00
1981/08/31	70.50
1981/09/01	87.20
1981/09/02	111.20
1981/09/03	138.55
1981/09/04	174.00
1981/09/05	193.00
1981/09/06	199.40
1981/09/07	208.20
1981/09/08	222.60
1981/09/09	228.20
1981/09/10	213.00
1981/09/11	185.00
1981/09/12	167.00
1981/09/13	138.55
1981/09/14	122.00
1981/09/15	112.40
1981/09/16	102.20
1981/09/17	92.60
1981/09/18	82.70
1981/09/19	78.85
1981/09/20	75.55
1981/09/21	72.50
1981/09/22	67.50
1981/09/23	66.50
1981/09/24	78.30
1981/09/25	80.50
1981/09/26	78.30
1981/09/27	70.00
1981/09/28	65.00
1981/09/29	78.85
1981/09/30	75.55
1981/10/01	72.00
1981/10/02	67.50
1981/10/03	64.00
1981/10/04	67.50
1981/10/05	66.50
1981/10/06	68.50
1981/10/07	81.60
1981/10/08	95.00
1981/10/09	108.20
1981/10/10	106.40
1981/10/11	114.80
1981/10/12	107.00
1981/10/13	89.60
1981/10/14	74.50
1981/10/15	66.00
1981/10/16	61.00
1981/10/17	71.50
1981/10/18	96.20
1981/10/19	102.80
1981/10/20	91.40
1981/10/21	77.75
1981/10/22	69.00
1981/10/23	63.00
1981/10/24	58.50
1981/10/25	55.00
1981/10/26	52.00
1981/10/27	48.40
1981/10/28	46.00
1981/10/29	44.80
1981/10/30	43.20
1981/10/31	42.00
1981/11/01	41.20
1981/11/02	40.40
1981/11/03	39.60
1981/11/04	40.80
1981/11/05	47.60
1981/11/06	55.50
1981/11/07	65.00
1981/11/08	56.50
1981/11/09	46.80
1981/11/10	42.40
1981/11/11	39.60
1981/11/12	37.20
1981/11/13	36.40
1981/11/14	35.60
1981/11/15	34.40
1981/11/16	34.00
1981/11/17	34.00
1981/11/18	34.80
1981/11/19	34.80
1981/11/20	34.00
1981/11/21	32.40
1981/11/22	30.80
1981/11/23	28.80
1981/11/24	28.40
1981/11/25	27.60
1981/11/26	26.80
1981/11/27	26.80
1981/11/28	28.00
1981/11/29	28.40
1981/11/30	27.60
1981/12/01	23.90
1981/12/02	22.50
1981/12/03	22.50
1981/12/04	22.50
1981/12/05	22.15
1981/12/06	21.80
1981/12/07	21.45
1981/12/08	20.75
1981/12/09	20.40
1981/12/10	20.05
1981/12/11	20.05
1981/12/12	19.35
1981/12/13	19.35
1981/12/14	19.35
1981/12/15	19.00
1981/12/16	18.65
1981/12/17	17.60
1981/12/18	17.25
1981/12/19	16.90
1981/12/20	16.90
1981/12/21	16.55
1981/12/22	16.20
1981/12/23	15.85
1981/12/24	15.50
1981/12/25	15.50
1981/12/26	15.85
1981/12/27	15.85
1981/12/28	15.85
1981/12/29	15.85
1981/12/30	15.50
1981/12/31	15.20
#===========================================
# Number of observations = 365 / 365
# Average = 60.97