1981/01/01	1.90
1981/01/02	1.80
1981/01/03	1.80
1981/01/04	1.70
1981/01/05	1.70
1981/01/06	1.60
1981/01/07	1.50
1981/01/08	1.50
1981/01/09	1.40
1981/01/10	1.40
1981/01/11	1.40
1981/01/12	1.40
1981/01/13	1.30
1981/01/14	1.50
1981/01/15	1.50
1981/01/16	1.50
1981/01/17	1.50
1981/01/18	1.40
1981/01/19	1.40
1981/01/20	1.30
1981/01/21	1.20
1981/01/22	1.30
1981/01/23	1.30
1981/01/24	1.20
1981/01/25	1.20
1981/01/26	1.20
1981/01/27	1.10
1981/01/28	1.10
1981/01/29	1.00
1981/01/30	1.00
1981/01/31	1.00
1981/02/01	1.20
1981/02/02	1.10
1981/02/03	1.10
1981/02/04	0.90
1981/02/05	0.90
1981/02/06	0.90
1981/02/07	1.00
1981/02/08	1.00
1981/02/09	1.00
1981/02/10	0.90
1981/02/11	0.90
1981/02/12	0.80
1981/02/13	0.72
1981/02/14	0.68
1981/02/15	0.64
1981/02/16	0.60
1981/02/17	0.60
1981/02/18	0.64
1981/02/19	0.76
1981/02/20	0.72
1981/02/21	0.68
1981/02/22	0.68
1981/02/23	0.68
1981/02/24	0.72
1981/02/25	0.72
1981/02/26	0.72
1981/02/27	0.68
1981/02/28	0.68
1981/03/01	0.64
1981/03/02	0.60
1981/03/03	0.56
1981/03/04	0.56
1981/03/05	0.64
1981/03/06	0.64
1981/03/07	0.90
1981/03/08	0.80
1981/03/09	0.64
1981/03/10	0.60
1981/03/11	0.56
1981/03/12	0.48
1981/03/13	0.48
1981/03/14	0.52
1981/03/15	0.48
1981/03/16	0.40
1981/03/17	0.48
1981/03/18	0.52
1981/03/19	0.60
1981/03/20	0.60
1981/03/21	0.64
1981/03/22	0.64
1981/03/23	0.68
1981/03/24	0.68
1981/03/25	0.64
1981/03/26	0.60
1981/03/27	0.56
1981/03/28	0.56
1981/03/29	0.60
1981/03/30	0.60
1981/03/31	0.56
1981/04/01	0.13
1981/04/02	0.15
1981/04/03	0.13
1981/04/04	0.10
1981/04/05	0.08
1981/04/06	0.05
1981/04/07	0.03
1981/04/08	0.03
1981/04/09	0
1981/04/10	0
1981/04/11	0
1981/04/12	0.03
1981/04/13	0.03
1981/04/14	0.05
1981/04/15	0.05
1981/04/16	0.08
1981/04/17	0.13
1981/04/18	0.25
1981/04/19	0.23
1981/04/20	0.20
1981/04/21	0.18
1981/04/22	0.18
1981/04/23	0.15
1981/04/24	0.15
1981/04/25	0.13
1981/04/26	0.10
1981/04/27	0.10
1981/04/28	0.08
1981/04/29	0.05
1981/04/30	0.05
1981/05/01	0.03
1981/05/02	0
1981/05/03	0
1981/05/04	13.55
1981/05/05	28.00
1981/05/06	2.66
1981/05/07	0.82
1981/05/08	0.43
1981/05/09	0.32
1981/05/10	2.32
1981/05/11	1.64
1981/05/12	1.14
1981/05/13	0.82
1981/05/14	0.50
1981/05/15	0.48
1981/05/16	0.48
1981/05/17	77.60
1981/05/18	8.63
1981/05/19	4.19
1981/05/20	3.34
1981/05/21	1.06
1981/05/22	4.89
1981/05/23	26.00
1981/05/24	38.60
1981/05/25	18.40
1981/05/26	12.20
1981/05/27	95.00
1981/05/28	15.65
1981/05/29	7.76
1981/05/30	6.41
1981/05/31	5.65
1981/06/01	4.36
1981/06/02	6.22
1981/06/03	4.36
1981/06/04	3.00
1981/06/05	1.81
1981/06/06	1.22
1981/06/07	0.98
1981/06/08	0.98
1981/06/09	0.90
1981/06/10	0.90
1981/06/11	0.82
1981/06/12	0.82
1981/06/13	0.74
1981/06/14	0.74
1981/06/15	0.66
1981/06/16	0.58
1981/06/17	0.50
1981/06/18	0.50
1981/06/19	0.50
1981/06/20	0.48
1981/06/21	0.48
1981/06/22	0.58
1981/06/23	1.14
1981/06/24	1.47
1981/06/25	2.15
1981/06/26	2.83
1981/06/27	2.83
1981/06/28	2.32
1981/06/29	1.30
1981/06/30	0.98
1981/07/01	0.98
1981/07/02	0.82
1981/07/03	0.50
1981/07/04	0.90
1981/07/05	1.06
1981/07/06	263.00
1981/07/07	96.00
1981/07/08	30.60
1981/07/09	26.50
1981/07/10	146.85
1981/07/11	49.60
1981/07/12	30.60
1981/07/13	-9999
1981/07/14	-9999
1981/07/15	-9999
1981/07/16	-9999
1981/07/17	-9999
1981/07/18	137.65
1981/07/19	98.00
1981/07/20	61.75
1981/07/21	48.30
1981/07/22	45.20
1981/07/23	34.45
1981/07/24	69.25
1981/07/25	39.80
1981/07/26	35.00
1981/07/27	33.35
1981/07/28	29.50
1981/07/29	-9999
1981/07/30	-9999
1981/07/31	-9999
1981/08/01	-9999
1981/08/02	-9999
1981/08/03	-9999
1981/08/04	42.20
1981/08/05	89.00
1981/08/06	76.00
1981/08/07	84.00
1981/08/08	21.35
1981/08/09	19.20
1981/08/10	17.20
1981/08/11	15.65
1981/08/12	14.60
1981/08/13	12.50
1981/08/14	10.40
1981/08/15	8.63
1981/08/16	6.60
1981/08/17	5.27
1981/08/18	18.80
1981/08/19	38.00
1981/08/20	29.00
1981/08/21	20.90
1981/08/22	12.50
1981/08/23	20.00
1981/08/24	32.80
1981/08/25	30.60
1981/08/26	14.25
1981/08/27	12.50
1981/08/28	11.60
1981/08/29	11.00
1981/08/30	9.50
1981/08/31	8.63
1981/09/01	15.30
1981/09/02	14.60
1981/09/03	16.40
1981/09/04	44.60
1981/09/05	23.15
1981/09/06	20.90
1981/09/07	16.40
1981/09/08	11.30
1981/09/09	9.50
1981/09/10	8.92
1981/09/11	8.63
1981/09/12	8.05
1981/09/13	6.41
1981/09/14	5.65
1981/09/15	4.70
1981/09/16	4.70
1981/09/17	4.70
1981/09/18	4.70
1981/09/19	4.70
1981/09/20	4.70
1981/09/21	4.89
1981/09/22	4.70
1981/09/23	4.36
1981/09/24	4.02
1981/09/25	3.85
1981/09/26	3.34
1981/09/27	3.17
1981/09/28	2.83
1981/09/29	2.83
1981/09/30	2.66
1981/10/01	2.32
1981/10/02	2.32
1981/10/03	8.63
1981/10/04	5.27
1981/10/05	3.85
1981/10/06	3.00
1981/10/07	2.66
1981/10/08	2.32
1981/10/09	3.17
1981/10/10	2.83
1981/10/11	22.70
1981/10/12	17.20
1981/10/13	16.80
1981/10/14	14.25
1981/10/15	13.55
1981/10/16	18.40
1981/10/17	14.25
1981/10/18	17.60
1981/10/19	20.45
1981/10/20	18.80
1981/10/21	17.20
1981/10/22	14.95
1981/10/23	11.60
1981/10/24	6.60
1981/10/25	5.65
1981/10/26	5.08
1981/10/27	4.36
1981/10/28	4.02
1981/10/29	3.68
1981/10/30	3.34
1981/10/31	3.17
1981/11/01	3.17
1981/11/02	3.17
1981/11/03	3.00
1981/11/04	3.00
1981/11/05	3.00
1981/11/06	2.83
1981/11/07	2.49
1981/11/08	2.32
1981/11/09	2.32
1981/11/10	2.15
1981/11/11	1.98
1981/11/12	1.98
1981/11/13	1.64
1981/11/14	1.47
1981/11/15	1.30
1981/11/16	2.15
1981/11/17	14.25
1981/11/18	35.00
1981/11/19	23.60
1981/11/20	16.00
1981/11/21	4.70
1981/11/22	4.36
1981/11/23	4.02
1981/11/24	3.68
1981/11/25	3.51
1981/11/26	3.34
1981/11/27	3.00
1981/11/28	2.83
1981/11/29	2.66
1981/11/30	2.49
1981/12/01	2.15
1981/12/02	2.15
1981/12/03	1.98
1981/12/04	1.98
1981/12/05	1.81
1981/12/06	1.64
1981/12/07	1.64
1981/12/08	1.64
1981/12/09	1.47
1981/12/10	1.47
1981/12/11	1.47
1981/12/12	1.47
1981/12/13	1.47
1981/12/14	1.47
1981/12/15	1.30
1981/12/16	1.30
1981/12/17	1.30
1981/12/18	1.22
1981/12/19	1.22
1981/12/20	1.22
1981/12/21	1.14
1981/12/22	1.14
1981/12/23	1.14
1981/12/24	1.14
1981/12/25	1.14
1981/12/26	1.06
1981/12/27	1.06
1981/12/28	1.06
1981/12/29	1.06
1981/12/30	1.06
1981/12/31	1.06
#===========================================
# Number of observations = 354 / 365
# Average = 9.19