1981/01/01	14.00
1981/01/02	13.60
1981/01/03	13.20
1981/01/04	12.80
1981/01/05	12.40
1981/01/06	12.40
1981/01/07	12.40
1981/01/08	12.40
1981/01/09	12.00
1981/01/10	11.70
1981/01/11	11.40
1981/01/12	11.10
1981/01/13	10.50
1981/01/14	10.20
1981/01/15	9.90
1981/01/16	9.90
1981/01/17	9.60
1981/01/18	9.60
1981/01/19	9.30
1981/01/20	9.30
1981/01/21	9.00
1981/01/22	9.00
1981/01/23	9.00
1981/01/24	9.00
1981/01/25	8.70
1981/01/26	8.40
1981/01/27	8.10
1981/01/28	8.10
1981/01/29	7.80
1981/01/30	7.50
1981/01/31	7.20
1981/02/01	7.20
1981/02/02	7.20
1981/02/03	7.20
1981/02/04	6.90
1981/02/05	6.60
1981/02/06	6.30
1981/02/07	6.60
1981/02/08	6.00
1981/02/09	6.00
1981/02/10	5.70
1981/02/11	5.40
1981/02/12	5.10
1981/02/13	4.80
1981/02/14	4.80
1981/02/15	4.80
1981/02/16	4.80
1981/02/17	4.50
1981/02/18	4.50
1981/02/19	4.50
1981/02/20	4.50
1981/02/21	4.50
1981/02/22	4.50
1981/02/23	4.20
1981/02/24	3.90
1981/02/25	3.90
1981/02/26	4.20
1981/02/27	5.40
1981/02/28	5.40
1981/03/01	9.00
1981/03/02	19.20
1981/03/03	15.60
1981/03/04	10.20
1981/03/05	8.70
1981/03/06	8.40
1981/03/07	21.20
1981/03/08	11.70
1981/03/09	12.80
1981/03/10	10.80
1981/03/11	8.70
1981/03/12	7.50
1981/03/13	7.80
1981/03/14	6.90
1981/03/15	6.90
1981/03/16	6.30
1981/03/17	5.70
1981/03/18	5.10
1981/03/19	4.80
1981/03/20	4.20
1981/03/21	4.20
1981/03/22	3.90
1981/03/23	3.90
1981/03/24	3.90
1981/03/25	3.60
1981/03/26	3.30
1981/03/27	3.30
1981/03/28	3.30
1981/03/29	3.30
1981/03/30	3.30
1981/03/31	3.30
1981/04/01	2.10
1981/04/02	2.10
1981/04/03	2.10
1981/04/04	2.40
1981/04/05	2.40
1981/04/06	2.40
1981/04/07	2.40
1981/04/08	2.10
1981/04/09	1.80
1981/04/10	1.50
1981/04/11	1.50
1981/04/12	2.10
1981/04/13	3.60
1981/04/14	16.60
1981/04/15	16.60
1981/04/16	15.80
1981/04/17	17.00
1981/04/18	12.60
1981/04/19	9.40
1981/04/20	8.10
1981/04/21	6.90
1981/04/22	9.40
1981/04/23	14.20
1981/04/24	11.80
1981/04/25	25.00
1981/04/26	25.00
1981/04/27	22.50
1981/04/28	13.80
1981/04/29	9.80
1981/04/30	8.70
1981/05/01	9.40
1981/05/02	12.20
1981/05/03	16.60
1981/05/04	20.50
1981/05/05	20.00
1981/05/06	44.00
1981/05/07	33.80
1981/05/08	25.00
1981/05/09	42.80
1981/05/10	29.00
1981/05/11	24.00
1981/05/12	19.50
1981/05/13	15.40
1981/05/14	11.80
1981/05/15	9.80
1981/05/16	8.70
1981/05/17	8.40
1981/05/18	9.00
1981/05/19	12.20
1981/05/20	22.50
1981/05/21	19.00
1981/05/22	15.40
1981/05/23	13.80
1981/05/24	13.40
1981/05/25	12.60
1981/05/26	11.80
1981/05/27	19.00
1981/05/28	23.50
1981/05/29	18.50
1981/05/30	15.00
1981/05/31	18.00
1981/06/01	18.50
1981/06/02	16.60
1981/06/03	22.00
1981/06/04	25.50
1981/06/05	19.50
1981/06/06	16.20
1981/06/07	14.20
1981/06/08	13.40
1981/06/09	12.60
1981/06/10	12.20
1981/06/11	12.60
1981/06/12	13.40
1981/06/13	13.80
1981/06/14	15.40
1981/06/15	20.50
1981/06/16	21.00
1981/06/17	19.00
1981/06/18	14.60
1981/06/19	17.50
1981/06/20	25.00
1981/06/21	20.50
1981/06/22	26.00
1981/06/23	20.00
1981/06/24	18.00
1981/06/25	18.00
1981/06/26	19.50
1981/06/27	22.00
1981/06/28	16.20
1981/06/29	14.20
1981/06/30	14.60
1981/07/01	16.20
1981/07/02	20.00
1981/07/03	27.50
1981/07/04	29.00
1981/07/05	32.00
1981/07/06	39.80
1981/07/07	54.20
1981/07/08	49.40
1981/07/09	47.00
1981/07/10	44.00
1981/07/11	40.40
1981/07/12	36.80
1981/07/13	32.00
1981/07/14	25.50
1981/07/15	22.00
1981/07/16	23.00
1981/07/17	28.00
1981/07/18	35.60
1981/07/19	49.40
1981/07/20	57.70
1981/07/21	130.50
1981/07/22	195.00
1981/07/23	171.00
1981/07/24	184.00
1981/07/25	188.00
1981/07/26	187.00
1981/07/27	188.00
1981/07/28	185.00
1981/07/29	182.00
1981/07/30	179.00
1981/07/31	175.00
1981/08/01	167.00
1981/08/02	158.00
1981/08/03	152.50
1981/08/04	145.20
1981/08/05	152.50
1981/08/06	178.00
1981/08/07	231.30
1981/08/08	290.70
1981/08/09	328.10
1981/08/10	312.70
1981/08/11	301.70
1981/08/12	298.40
1981/08/13	297.30
1981/08/14	291.80
1981/08/15	286.30
1981/08/16	281.90
1981/08/17	280.80
1981/08/18	275.30
1981/08/19	276.40
1981/08/20	268.70
1981/08/21	273.10
1981/08/22	283.00
1981/08/23	268.70
1981/08/24	258.80
1981/08/25	256.60
1981/08/26	262.10
1981/08/27	275.30
1981/08/28	286.30
1981/08/29	297.30
1981/08/30	306.10
1981/08/31	311.60
1981/09/01	319.30
1981/09/02	324.80
1981/09/03	302.80
1981/09/04	259.90
1981/09/05	214.00
1981/09/06	171.00
1981/09/07	148.80
1981/09/08	152.50
1981/09/09	173.00
1981/09/10	196.00
1981/09/11	218.00
1981/09/12	257.70
1981/09/13	277.50
1981/09/14	299.50
1981/09/15	309.40
1981/09/16	281.90
1981/09/17	253.30
1981/09/18	278.60
1981/09/19	225.00
1981/09/20	211.00
1981/09/21	208.00
1981/09/22	210.00
1981/09/23	195.00
1981/09/24	181.00
1981/09/25	203.00
1981/09/26	199.00
1981/09/27	225.00
1981/09/28	235.70
1981/09/29	220.00
1981/09/30	218.00
1981/10/01	214.00
1981/10/02	209.00
1981/10/03	209.00
1981/10/04	221.00
1981/10/05	214.00
1981/10/06	197.00
1981/10/07	181.00
1981/10/08	182.00
1981/10/09	192.00
1981/10/10	210.00
1981/10/11	219.00
1981/10/12	224.00
1981/10/13	218.00
1981/10/14	200.00
1981/10/15	173.00
1981/10/16	154.30
1981/10/17	134.20
1981/10/18	118.60
1981/10/19	115.80
1981/10/20	122.30
1981/10/21	117.70
1981/10/22	106.70
1981/10/23	99.00
1981/10/24	94.20
1981/10/25	94.20
1981/10/26	98.20
1981/10/27	99.80
1981/10/28	100.60
1981/10/29	100.60
1981/10/30	99.80
1981/10/31	95.00
1981/11/01	88.60
1981/11/02	82.20
1981/11/03	75.80
1981/11/04	66.80
1981/11/05	59.80
1981/11/06	61.20
1981/11/07	79.80
1981/11/08	73.40
1981/11/09	66.10
1981/11/10	76.60
1981/11/11	82.20
1981/11/12	79.00
1981/11/13	75.00
1981/11/14	71.80
1981/11/15	69.60
1981/11/16	68.90
1981/11/17	67.50
1981/11/18	66.10
1981/11/19	66.10
1981/11/20	65.40
1981/11/21	63.30
1981/11/22	63.30
1981/11/23	61.20
1981/11/24	59.10
1981/11/25	55.60
1981/11/26	54.20
1981/11/27	52.10
1981/11/28	50.00
1981/11/29	49.40
1981/11/30	45.80
1981/12/01	42.20
1981/12/02	38.60
1981/12/03	36.20
1981/12/04	34.40
1981/12/05	32.00
1981/12/06	31.00
1981/12/07	30.00
1981/12/08	29.50
1981/12/09	29.00
1981/12/10	28.00
1981/12/11	27.00
1981/12/12	26.00
1981/12/13	25.00
1981/12/14	24.00
1981/12/15	23.00
1981/12/16	23.00
1981/12/17	22.00
1981/12/18	22.00
1981/12/19	21.50
1981/12/20	20.50
1981/12/21	20.00
1981/12/22	20.00
1981/12/23	19.50
1981/12/24	19.00
1981/12/25	19.00
1981/12/26	18.50
1981/12/27	18.00
1981/12/28	17.50
1981/12/29	17.00
1981/12/30	16.60
1981/12/31	16.20
#===========================================
# Number of observations = 365 / 365
# Average = 74.93