1981/01/01	2.20
1981/01/02	1.87
1981/01/03	1.80
1981/01/04	1.53
1981/01/05	1.53
1981/01/06	1.53
1981/01/07	1.53
1981/01/08	1.53
1981/01/09	1.53
1981/01/10	1.47
1981/01/11	1.47
1981/01/12	1.40
1981/01/13	1.40
1981/01/14	1.40
1981/01/15	1.40
1981/01/16	1.33
1981/01/17	1.33
1981/01/18	1.33
1981/01/19	1.33
1981/01/20	1.33
1981/01/21	1.33
1981/01/22	1.33
1981/01/23	1.33
1981/01/24	1.33
1981/01/25	1.33
1981/01/26	1.33
1981/01/27	1.33
1981/01/28	1.33
1981/01/29	1.33
1981/01/30	1.40
1981/01/31	1.40
1981/02/01	1.27
1981/02/02	1.27
1981/02/03	1.27
1981/02/04	1.27
1981/02/05	1.27
1981/02/06	1.40
1981/02/07	1.33
1981/02/08	1.33
1981/02/09	1.27
1981/02/10	1.33
1981/02/11	1.27
1981/02/12	1.27
1981/02/13	1.33
1981/02/14	1.33
1981/02/15	1.27
1981/02/16	1.27
1981/02/17	1.27
1981/02/18	1.33
1981/02/19	1.27
1981/02/20	1.27
1981/02/21	1.27
1981/02/22	1.27
1981/02/23	1.27
1981/02/24	1.27
1981/02/25	1.27
1981/02/26	1.27
1981/02/27	1.27
1981/02/28	1.27
1981/03/01	1.27
1981/03/02	1.27
1981/03/03	1.27
1981/03/04	1.27
1981/03/05	1.27
1981/03/06	1.27
1981/03/07	1.27
1981/03/08	1.27
1981/03/09	1.27
1981/03/10	1.27
1981/03/11	1.27
1981/03/12	1.27
1981/03/13	1.27
1981/03/14	1.27
1981/03/15	1.27
1981/03/16	1.27
1981/03/17	1.27
1981/03/18	1.33
1981/03/19	1.33
1981/03/20	1.33
1981/03/21	1.33
1981/03/22	1.33
1981/03/23	1.33
1981/03/24	1.33
1981/03/25	1.40
1981/03/26	1.33
1981/03/27	1.33
1981/03/28	1.27
1981/03/29	1.27
1981/03/30	1.27
1981/03/31	1.27
1981/04/01	0.18
1981/04/02	0.23
1981/04/03	0.20
1981/04/04	0.20
1981/04/05	0.18
1981/04/06	0.18
1981/04/07	0.18
1981/04/08	0.16
1981/04/09	0.16
1981/04/10	0.16
1981/04/11	0.16
1981/04/12	0.18
1981/04/13	0.20
1981/04/14	0.23
1981/04/15	0.23
1981/04/16	1.66
1981/04/17	0.44
1981/04/18	0.32
1981/04/19	0.26
1981/04/20	0.29
1981/04/21	0.26
1981/04/22	0.35
1981/04/23	0.38
1981/04/24	0.29
1981/04/25	0.20
1981/04/26	0.56
1981/04/27	0.56
1981/04/28	0.38
1981/04/29	0.35
1981/04/30	0.38
1981/05/01	0.41
1981/05/02	0.44
1981/05/03	0.62
1981/05/04	6.39
1981/05/05	11.80
1981/05/06	7.43
1981/05/07	4.83
1981/05/08	4.83
1981/05/09	7.56
1981/05/10	2.16
1981/05/11	1.10
1981/05/12	0.86
1981/05/13	0.68
1981/05/14	0.38
1981/05/15	0.41
1981/05/16	0.62
1981/05/17	1.80
1981/05/18	0.50
1981/05/19	0.47
1981/05/20	4.20
1981/05/21	3.10
1981/05/22	3.20
1981/05/23	14.69
1981/05/24	19.40
1981/05/25	12.99
1981/05/26	12.14
1981/05/27	12.99
1981/05/28	14.86
1981/05/29	13.33
1981/05/30	11.00
1981/05/31	8.92
1981/06/01	7.95
1981/06/02	8.34
1981/06/03	6.91
1981/06/04	6.13
1981/06/05	4.70
1981/06/06	2.70
1981/06/07	1.98
1981/06/08	1.89
1981/06/09	1.73
1981/06/10	1.80
1981/06/11	2.25
1981/06/12	2.80
1981/06/13	2.80
1981/06/14	2.16
1981/06/15	1.45
1981/06/16	0.98
1981/06/17	0.92
1981/06/18	0.86
1981/06/19	1.52
1981/06/20	1.17
1981/06/21	1.31
1981/06/22	1.17
1981/06/23	0.86
1981/06/24	0.62
1981/06/25	0.41
1981/06/26	0.23
1981/06/27	0.23
1981/06/28	0.32
1981/06/29	0.47
1981/06/30	0.38
1981/07/01	0.26
1981/07/02	0.23
1981/07/03	0.23
1981/07/04	0.23
1981/07/05	0.23
1981/07/06	0.23
1981/07/07	0.29
1981/07/08	0.35
1981/07/09	0.35
1981/07/10	0.35
1981/07/11	0.38
1981/07/12	0.41
1981/07/13	0.50
1981/07/14	0.47
1981/07/15	0.44
1981/07/16	0.38
1981/07/17	0.35
1981/07/18	0.32
1981/07/19	0.35
1981/07/20	0.38
1981/07/21	0.41
1981/07/22	6.00
1981/07/23	1.59
1981/07/24	0.50
1981/07/25	2.70
1981/07/26	3.00
1981/07/27	4.30
1981/07/28	3.50
1981/07/29	4.83
1981/07/30	5.09
1981/07/31	5.87
1981/08/01	6.91
1981/08/02	7.95
1981/08/03	6.65
1981/08/04	5.48
1981/08/05	6.13
1981/08/06	5.35
1981/08/07	6.78
1981/08/08	5.35
1981/08/09	4.40
1981/08/10	3.80
1981/08/11	4.83
1981/08/12	4.30
1981/08/13	2.07
1981/08/14	1.31
1981/08/15	1.24
1981/08/16	1.24
1981/08/17	0.98
1981/08/18	0.74
1981/08/19	0.56
1981/08/20	0.44
1981/08/21	4.10
1981/08/22	2.61
1981/08/23	1.45
1981/08/24	0.92
1981/08/25	0.74
1981/08/26	0.68
1981/08/27	0.56
1981/08/28	0.56
1981/08/29	0.62
1981/08/30	0.50
1981/08/31	0.56
1981/09/01	1.73
1981/09/02	2.43
1981/09/03	1.66
1981/09/04	1.10
1981/09/05	0.98
1981/09/06	1.17
1981/09/07	1.59
1981/09/08	1.59
1981/09/09	1.89
1981/09/10	2.52
1981/09/11	2.61
1981/09/12	2.70
1981/09/13	4.50
1981/09/14	4.20
1981/09/15	3.20
1981/09/16	2.34
1981/09/17	1.73
1981/09/18	1.04
1981/09/19	0.80
1981/09/20	0.62
1981/09/21	0.68
1981/09/22	0.74
1981/09/23	0.68
1981/09/24	0.56
1981/09/25	0.50
1981/09/26	0.50
1981/09/27	0.56
1981/09/28	0.62
1981/09/29	0.50
1981/09/30	0.62
1981/10/01	0.86
1981/10/02	0.68
1981/10/03	0.62
1981/10/04	0.56
1981/10/05	0.62
1981/10/06	0.56
1981/10/07	0.50
1981/10/08	0.47
1981/10/09	2.07
1981/10/10	4.10
1981/10/11	2.16
1981/10/12	4.20
1981/10/13	3.30
1981/10/14	4.10
1981/10/15	3.30
1981/10/16	3.20
1981/10/17	4.96
1981/10/18	7.69
1981/10/19	9.40
1981/10/20	8.47
1981/10/21	9.24
1981/10/22	7.04
1981/10/23	5.74
1981/10/24	4.60
1981/10/25	4.50
1981/10/26	4.50
1981/10/27	3.60
1981/10/28	2.16
1981/10/29	1.89
1981/10/30	1.38
1981/10/31	1.38
1981/11/01	1.04
1981/11/02	0.98
1981/11/03	0.92
1981/11/04	0.80
1981/11/05	0.74
1981/11/06	0.62
1981/11/07	0.62
1981/11/08	0.68
1981/11/09	0.74
1981/11/10	1.10
1981/11/11	1.10
1981/11/12	1.24
1981/11/13	1.45
1981/11/14	1.59
1981/11/15	3.30
1981/11/16	3.50
1981/11/17	8.47
1981/11/18	9.24
1981/11/19	11.00
1981/11/20	9.88
1981/11/21	9.56
1981/11/22	8.47
1981/11/23	7.69
1981/11/24	6.78
1981/11/25	6.39
1981/11/26	6.39
1981/11/27	5.87
1981/11/28	5.35
1981/11/29	5.09
1981/11/30	5.09
1981/12/01	4.60
1981/12/02	4.40
1981/12/03	4.20
1981/12/04	3.90
1981/12/05	3.40
1981/12/06	2.34
1981/12/07	1.59
1981/12/08	1.24
1981/12/09	1.17
1981/12/10	0.92
1981/12/11	0.80
1981/12/12	0.80
1981/12/13	0.80
1981/12/14	1.59
1981/12/15	1.52
1981/12/16	1.38
1981/12/17	1.17
1981/12/18	0.92
1981/12/19	0.74
1981/12/20	0.80
1981/12/21	0.74
1981/12/22	0.68
1981/12/23	0.62
1981/12/24	0.62
1981/12/25	0.50
1981/12/26	0.47
1981/12/27	0.44
1981/12/28	0.32
1981/12/29	0.26
1981/12/30	0.20
1981/12/31	0.23
#===========================================
# Number of observations = 365 / 365
# Average = 2.30