1981/01/01	1.83
1981/01/02	1.80
1981/01/03	1.77
1981/01/04	1.73
1981/01/05	1.70
1981/01/06	1.70
1981/01/07	1.70
1981/01/08	1.70
1981/01/09	1.73
1981/01/10	1.70
1981/01/11	1.67
1981/01/12	1.70
1981/01/13	1.70
1981/01/14	1.67
1981/01/15	1.67
1981/01/16	1.63
1981/01/17	1.63
1981/01/18	1.63
1981/01/19	1.60
1981/01/20	1.60
1981/01/21	1.60
1981/01/22	1.50
1981/01/23	1.50
1981/01/24	1.50
1981/01/25	1.63
1981/01/26	1.70
1981/01/27	1.67
1981/01/28	1.67
1981/01/29	1.63
1981/01/30	1.63
1981/01/31	1.67
1981/02/01	1.80
1981/02/02	1.67
1981/02/03	1.63
1981/02/04	1.43
1981/02/05	1.43
1981/02/06	1.37
1981/02/07	1.37
1981/02/08	1.37
1981/02/09	1.33
1981/02/10	1.37
1981/02/11	1.37
1981/02/12	1.33
1981/02/13	1.30
1981/02/14	1.30
1981/02/15	1.33
1981/02/16	1.30
1981/02/17	1.27
1981/02/18	1.23
1981/02/19	1.23
1981/02/20	1.27
1981/02/21	1.30
1981/02/22	1.27
1981/02/23	1.23
1981/02/24	1.23
1981/02/25	1.27
1981/02/26	1.30
1981/02/27	1.27
1981/02/28	1.23
1981/03/01	1.23
1981/03/02	1.20
1981/03/03	1.23
1981/03/04	1.27
1981/03/05	1.23
1981/03/06	1.30
1981/03/07	1.27
1981/03/08	1.27
1981/03/09	1.23
1981/03/10	1.27
1981/03/11	1.27
1981/03/12	1.27
1981/03/13	1.27
1981/03/14	1.20
1981/03/15	1.20
1981/03/16	1.20
1981/03/17	1.13
1981/03/18	1.13
1981/03/19	1.13
1981/03/20	1.13
1981/03/21	1.17
1981/03/22	1.13
1981/03/23	1.13
1981/03/24	1.17
1981/03/25	1.20
1981/03/26	1.20
1981/03/27	1.13
1981/03/28	1.17
1981/03/29	1.17
1981/03/30	1.20
1981/03/31	1.17
1981/04/01	0.26
1981/04/02	0.29
1981/04/03	0.26
1981/04/04	0.29
1981/04/05	0.32
1981/04/06	0.32
1981/04/07	0.32
1981/04/08	0.32
1981/04/09	0.32
1981/04/10	0.32
1981/04/11	0.23
1981/04/12	0.23
1981/04/13	0.23
1981/04/14	0.32
1981/04/15	0.32
1981/04/16	0.55
1981/04/17	0.65
1981/04/18	0.55
1981/04/19	0.55
1981/04/20	0.47
1981/04/21	0.47
1981/04/22	0.44
1981/04/23	0.38
1981/04/24	0.38
1981/04/25	0.38
1981/04/26	0.38
1981/04/27	2.30
1981/04/28	0.85
1981/04/29	0.70
1981/04/30	0.50
1981/05/01	0.65
1981/05/02	0.50
1981/05/03	0.55
1981/05/04	4.10
1981/05/05	8.00
1981/05/06	1.90
1981/05/07	1.40
1981/05/08	0.80
1981/05/09	0.75
1981/05/10	0.70
1981/05/11	0.65
1981/05/12	0.70
1981/05/13	0.60
1981/05/14	0.60
1981/05/15	0.55
1981/05/16	0.55
1981/05/17	0.65
1981/05/18	0.60
1981/05/19	9.00
1981/05/20	7.20
1981/05/21	2.15
1981/05/22	9.00
1981/05/23	6.60
1981/05/24	27.50
1981/05/25	24.20
1981/05/26	17.00
1981/05/27	4.85
1981/05/28	4.40
1981/05/29	3.05
1981/05/30	2.30
1981/05/31	3.65
1981/06/01	2.30
1981/06/02	6.80
1981/06/03	4.40
1981/06/04	2.60
1981/06/05	1.80
1981/06/06	1.30
1981/06/07	0.95
1981/06/08	1.40
1981/06/09	1.80
1981/06/10	1.40
1981/06/11	1.50
1981/06/12	1.60
1981/06/13	1.70
1981/06/14	3.20
1981/06/15	2.75
1981/06/16	1.60
1981/06/17	1.40
1981/06/18	5.20
1981/06/19	4.25
1981/06/20	4.10
1981/06/21	3.95
1981/06/22	4.10
1981/06/23	3.50
1981/06/24	3.05
1981/06/25	2.60
1981/06/26	2.60
1981/06/27	2.15
1981/06/28	2.45
1981/06/29	2.15
1981/06/30	2.00
1981/07/01	2.30
1981/07/02	2.60
1981/07/03	2.00
1981/07/04	1.30
1981/07/05	1.10
1981/07/06	11.67
1981/07/07	15.67
1981/07/08	7.00
1981/07/09	5.40
1981/07/10	5.20
1981/07/11	4.55
1981/07/12	4.25
1981/07/13	3.20
1981/07/14	2.30
1981/07/15	2.75
1981/07/16	3.95
1981/07/17	20.30
1981/07/18	6.20
1981/07/19	4.85
1981/07/20	5.00
1981/07/21	10.07
1981/07/22	7.40
1981/07/23	4.70
1981/07/24	5.20
1981/07/25	5.40
1981/07/26	3.65
1981/07/27	3.20
1981/07/28	3.65
1981/07/29	4.40
1981/07/30	3.50
1981/07/31	4.85
1981/08/01	4.10
1981/08/02	14.87
1981/08/03	6.80
1981/08/04	4.70
1981/08/05	6.60
1981/08/06	8.20
1981/08/07	11.93
1981/08/08	7.60
1981/08/09	5.60
1981/08/10	4.70
1981/08/11	11.67
1981/08/12	10.87
1981/08/13	7.40
1981/08/14	6.00
1981/08/15	4.70
1981/08/16	4.55
1981/08/17	3.95
1981/08/18	3.65
1981/08/19	6.60
1981/08/20	5.60
1981/08/21	4.85
1981/08/22	4.25
1981/08/23	10.60
1981/08/24	8.80
1981/08/25	5.60
1981/08/26	4.55
1981/08/27	4.10
1981/08/28	3.80
1981/08/29	3.35
1981/08/30	3.20
1981/08/31	3.05
1981/09/01	3.80
1981/09/02	16.47
1981/09/03	5.40
1981/09/04	5.00
1981/09/05	7.40
1981/09/06	9.00
1981/09/07	8.40
1981/09/08	7.20
1981/09/09	6.00
1981/09/10	8.20
1981/09/11	7.20
1981/09/12	8.20
1981/09/13	5.60
1981/09/14	4.10
1981/09/15	3.05
1981/09/16	3.05
1981/09/17	4.25
1981/09/18	2.60
1981/09/19	4.25
1981/09/20	3.50
1981/09/21	4.40
1981/09/22	3.05
1981/09/23	2.15
1981/09/24	3.65
1981/09/25	3.05
1981/09/26	3.20
1981/09/27	2.45
1981/09/28	2.00
1981/09/29	2.00
1981/09/30	2.30
1981/10/01	2.60
1981/10/02	4.10
1981/10/03	3.35
1981/10/04	7.40
1981/10/05	7.40
1981/10/06	3.65
1981/10/07	3.20
1981/10/08	4.40
1981/10/09	3.50
1981/10/10	2.90
1981/10/11	39.27
1981/10/12	7.80
1981/10/13	6.80
1981/10/14	25.70
1981/10/15	7.40
1981/10/16	5.80
1981/10/17	62.50
1981/10/18	54.85
1981/10/19	24.50
1981/10/20	14.33
1981/10/21	13.00
1981/10/22	10.87
1981/10/23	9.00
1981/10/24	9.80
1981/10/25	9.80
1981/10/26	32.67
1981/10/27	8.80
1981/10/28	7.00
1981/10/29	6.60
1981/10/30	5.80
1981/10/31	5.20
1981/11/01	5.00
1981/11/02	4.85
1981/11/03	4.85
1981/11/04	4.70
1981/11/05	4.85
1981/11/06	4.55
1981/11/07	6.60
1981/11/08	14.07
1981/11/09	36.33
1981/11/10	16.20
1981/11/11	10.60
1981/11/12	8.80
1981/11/13	8.80
1981/11/14	9.00
1981/11/15	16.20
1981/11/16	129.40
1981/11/17	68.50
1981/11/18	80.40
1981/11/19	75.80
1981/11/20	74.15
1981/11/21	21.20
1981/11/22	16.73
1981/11/23	15.40
1981/11/24	14.33
1981/11/25	13.27
1981/11/26	12.73
1981/11/27	11.93
1981/11/28	26.30
1981/11/29	13.53
1981/11/30	12.20
1981/12/01	11.40
1981/12/02	10.87
1981/12/03	10.33
1981/12/04	10.07
1981/12/05	9.27
1981/12/06	9.00
1981/12/07	8.80
1981/12/08	8.60
1981/12/09	8.20
1981/12/10	7.20
1981/12/11	8.40
1981/12/12	7.80
1981/12/13	7.20
1981/12/14	19.40
1981/12/15	11.40
1981/12/16	8.40
1981/12/17	7.80
1981/12/18	7.60
1981/12/19	7.40
1981/12/20	7.20
1981/12/21	6.80
1981/12/22	6.60
1981/12/23	6.40
1981/12/24	6.20
1981/12/25	6.00
1981/12/26	5.80
1981/12/27	5.20
1981/12/28	5.00
1981/12/29	4.85
1981/12/30	4.70
1981/12/31	4.55
#===========================================
# Number of observations = 365 / 365
# Average = 6.25