1981/01/01	1.70
1981/01/02	1.50
1981/01/03	1.50
1981/01/04	1.50
1981/01/05	1.40
1981/01/06	1.30
1981/01/07	1.30
1981/01/08	1.50
1981/01/09	1.70
1981/01/10	1.70
1981/01/11	1.70
1981/01/12	1.70
1981/01/13	1.90
1981/01/14	1.90
1981/01/15	1.90
1981/01/16	2.30
1981/01/17	3.30
1981/01/18	3.10
1981/01/19	2.90
1981/01/20	2.90
1981/01/21	2.50
1981/01/22	2.50
1981/01/23	2.50
1981/01/24	2.50
1981/01/25	2.30
1981/01/26	2.30
1981/01/27	2.50
1981/01/28	2.50
1981/01/29	2.50
1981/01/30	2.50
1981/01/31	2.30
1981/02/01	2.10
1981/02/02	2.10
1981/02/03	2.10
1981/02/04	2.10
1981/02/05	1.70
1981/02/06	1.70
1981/02/07	1.90
1981/02/08	1.90
1981/02/09	2.10
1981/02/10	2.10
1981/02/11	2.30
1981/02/12	2.30
1981/02/13	2.50
1981/02/14	2.50
1981/02/15	2.30
1981/02/16	1.90
1981/02/17	1.50
1981/02/18	1.50
1981/02/19	1.50
1981/02/20	1.40
1981/02/21	1.40
1981/02/22	1.50
1981/02/23	1.30
1981/02/24	1.30
1981/02/25	1.10
1981/02/26	1.10
1981/02/27	1.10
1981/02/28	1.10
1981/03/01	1.10
1981/03/02	1.10
1981/03/03	1.10
1981/03/04	1.30
1981/03/05	1.10
1981/03/06	1.20
1981/03/07	1.20
1981/03/08	0.60
1981/03/09	0.30
1981/03/10	0.30
1981/03/11	0.30
1981/03/12	0.80
1981/03/13	0.70
1981/03/14	0.70
1981/03/15	0.60
1981/03/16	0.45
1981/03/17	0.35
1981/03/18	0.70
1981/03/19	0.80
1981/03/20	0.80
1981/03/21	0.80
1981/03/22	0.70
1981/03/23	0.80
1981/03/24	0.60
1981/03/25	0.60
1981/03/26	0.60
1981/03/27	0.35
1981/03/28	0.30
1981/03/29	0.20
1981/03/30	0.15
1981/03/31	0.10
1981/04/01	0.10
1981/04/02	0.15
1981/04/03	0.15
1981/04/04	0.25
1981/04/05	0.20
1981/04/06	0.10
1981/04/07	0.05
1981/04/08	0.05
1981/04/09	0.20
1981/04/10	0.05
1981/04/11	0
1981/04/12	0
1981/04/13	0
1981/04/14	0.15
1981/04/15	0.45
1981/04/16	0.45
1981/04/17	0.50
1981/04/18	0.55
1981/04/19	0.45
1981/04/20	0.40
1981/04/21	0.25
1981/04/22	0.20
1981/04/23	0.10
1981/04/24	0.05
1981/04/25	0
1981/04/26	0.50
1981/04/27	4.80
1981/04/28	0.85
1981/04/29	0.50
1981/04/30	0.40
1981/05/01	0.30
1981/05/02	0.25
1981/05/03	0.15
1981/05/04	0.35
1981/05/05	6.80
1981/05/06	3.60
1981/05/07	1.40
1981/05/08	0.85
1981/05/09	0.70
1981/05/10	0.60
1981/05/11	0.55
1981/05/12	0.50
1981/05/13	0.45
1981/05/14	1.20
1981/05/15	1.60
1981/05/16	0.65
1981/05/17	0.50
1981/05/18	0.85
1981/05/19	0.85
1981/05/20	1.40
1981/05/21	0.85
1981/05/22	0.80
1981/05/23	2.40
1981/05/24	1.60
1981/05/25	2.40
1981/05/26	2.80
1981/05/27	5.70
1981/05/28	4.50
1981/05/29	2.40
1981/05/30	1.00
1981/05/31	0.80
1981/06/01	0.65
1981/06/02	6.00
1981/06/03	6.00
1981/06/04	2.40
1981/06/05	13.20
1981/06/06	3.30
1981/06/07	1.80
1981/06/08	1.20
1981/06/09	1.40
1981/06/10	1.40
1981/06/11	1.40
1981/06/12	0.90
1981/06/13	0.75
1981/06/14	0.80
1981/06/15	0.70
1981/06/16	0.60
1981/06/17	0.55
1981/06/18	1.00
1981/06/19	1.40
1981/06/20	1.40
1981/06/21	0.85
1981/06/22	0.75
1981/06/23	0.60
1981/06/24	0.65
1981/06/25	0.85
1981/06/26	1.40
1981/06/27	1.60
1981/06/28	1.60
1981/06/29	1.40
1981/06/30	0.95
1981/07/01	0.85
1981/07/02	0.70
1981/07/03	0.55
1981/07/04	0.65
1981/07/05	0.70
1981/07/06	121.00
1981/07/07	114.00
1981/07/08	24.40
1981/07/09	16.40
1981/07/10	14.80
1981/07/11	14.80
1981/07/12	14.00
1981/07/13	11.60
1981/07/14	9.20
1981/07/15	8.40
1981/07/16	7.20
1981/07/17	7.60
1981/07/18	7.20
1981/07/19	7.60
1981/07/20	20.00
1981/07/21	34.60
1981/07/22	23.20
1981/07/23	16.00
1981/07/24	16.00
1981/07/25	18.80
1981/07/26	14.80
1981/07/27	16.00
1981/07/28	19.60
1981/07/29	23.20
1981/07/30	25.20
1981/07/31	39.40
1981/08/01	27.00
1981/08/02	33.40
1981/08/03	23.20
1981/08/04	20.80
1981/08/05	26.50
1981/08/06	25.60
1981/08/07	26.00
1981/08/08	22.80
1981/08/09	19.20
1981/08/10	42.40
1981/08/11	76.40
1981/08/12	23.60
1981/08/13	17.60
1981/08/14	15.20
1981/08/15	13.60
1981/08/16	11.60
1981/08/17	10.80
1981/08/18	10.80
1981/08/19	14.00
1981/08/20	20.00
1981/08/21	13.60
1981/08/22	11.60
1981/08/23	12.00
1981/08/24	15.20
1981/08/25	12.00
1981/08/26	10.00
1981/08/27	8.40
1981/08/28	8.00
1981/08/29	7.60
1981/08/30	7.20
1981/08/31	6.80
1981/09/01	29.00
1981/09/02	22.40
1981/09/03	15.60
1981/09/04	20.40
1981/09/05	15.20
1981/09/06	21.60
1981/09/07	25.20
1981/09/08	26.50
1981/09/09	21.60
1981/09/10	16.40
1981/09/11	14.40
1981/09/12	12.00
1981/09/13	10.40
1981/09/14	10.00
1981/09/15	8.80
1981/09/16	10.00
1981/09/17	10.00
1981/09/18	10.00
1981/09/19	8.00
1981/09/20	8.80
1981/09/21	8.00
1981/09/22	8.00
1981/09/23	7.60
1981/09/24	9.60
1981/09/25	10.00
1981/09/26	11.60
1981/09/27	10.00
1981/09/28	8.40
1981/09/29	9.60
1981/09/30	8.00
1981/10/01	6.40
1981/10/02	10.40
1981/10/03	6.40
1981/10/04	9.20
1981/10/05	6.80
1981/10/06	5.70
1981/10/07	5.10
1981/10/08	10.00
1981/10/09	14.40
1981/10/10	9.60
1981/10/11	10.00
1981/10/12	8.80
1981/10/13	7.60
1981/10/14	10.40
1981/10/15	8.80
1981/10/16	6.80
1981/10/17	15.60
1981/10/18	12.00
1981/10/19	14.00
1981/10/20	9.60
1981/10/21	8.00
1981/10/22	7.60
1981/10/23	9.60
1981/10/24	10.00
1981/10/25	11.60
1981/10/26	10.80
1981/10/27	9.60
1981/10/28	8.40
1981/10/29	7.60
1981/10/30	7.20
1981/10/31	6.80
1981/11/01	6.80
1981/11/02	8.40
1981/11/03	7.60
1981/11/04	6.80
1981/11/05	6.00
1981/11/06	5.70
1981/11/07	5.40
1981/11/08	5.70
1981/11/09	6.80
1981/11/10	6.00
1981/11/11	6.00
1981/11/12	5.70
1981/11/13	5.10
1981/11/14	4.80
1981/11/15	6.00
1981/11/16	8.00
1981/11/17	10.80
1981/11/18	12.40
1981/11/19	9.60
1981/11/20	8.00
1981/11/21	7.20
1981/11/22	6.80
1981/11/23	5.70
1981/11/24	5.40
1981/11/25	5.10
1981/11/26	4.80
1981/11/27	4.50
1981/11/28	4.80
1981/11/29	4.50
1981/11/30	4.20
1981/12/01	3.90
1981/12/02	3.60
1981/12/03	3.60
1981/12/04	3.30
1981/12/05	3.30
1981/12/06	2.80
1981/12/07	2.60
1981/12/08	2.60
1981/12/09	2.40
1981/12/10	2.40
1981/12/11	2.40
1981/12/12	2.60
1981/12/13	2.40
1981/12/14	2.60
1981/12/15	4.20
1981/12/16	2.80
1981/12/17	2.40
1981/12/18	2.40
1981/12/19	2.40
1981/12/20	2.20
1981/12/21	2.20
1981/12/22	2.20
1981/12/23	2.20
1981/12/24	2.20
1981/12/25	2.20
1981/12/26	2.20
1981/12/27	2.20
1981/12/28	2.20
1981/12/29	2.20
1981/12/30	2.20
1981/12/31	2.20
#===========================================
# Number of observations = 365 / 365
# Average = 6.75