1981/01/01	3.80
1981/01/02	3.80
1981/01/03	3.80
1981/01/04	3.60
1981/01/05	3.60
1981/01/06	3.60
1981/01/07	3.60
1981/01/08	3.60
1981/01/09	3.60
1981/01/10	3.60
1981/01/11	3.40
1981/01/12	3.40
1981/01/13	3.40
1981/01/14	3.40
1981/01/15	3.40
1981/01/16	3.40
1981/01/17	3.40
1981/01/18	3.40
1981/01/19	3.40
1981/01/20	3.40
1981/01/21	3.40
1981/01/22	3.40
1981/01/23	3.20
1981/01/24	3.20
1981/01/25	3.20
1981/01/26	3.20
1981/01/27	3.20
1981/01/28	3.20
1981/01/29	3.00
1981/01/30	3.00
1981/01/31	3.00
1981/02/01	3.00
1981/02/02	3.00
1981/02/03	2.90
1981/02/04	2.80
1981/02/05	2.80
1981/02/06	2.60
1981/02/07	2.60
1981/02/08	2.60
1981/02/09	2.60
1981/02/10	2.60
1981/02/11	2.80
1981/02/12	2.60
1981/02/13	2.50
1981/02/14	2.50
1981/02/15	2.50
1981/02/16	2.50
1981/02/17	2.50
1981/02/18	2.40
1981/02/19	2.40
1981/02/20	2.40
1981/02/21	2.40
1981/02/22	2.30
1981/02/23	2.30
1981/02/24	2.30
1981/02/25	2.30
1981/02/26	2.30
1981/02/27	2.30
1981/02/28	2.30
1981/03/01	2.20
1981/03/02	2.20
1981/03/03	2.20
1981/03/04	2.20
1981/03/05	2.20
1981/03/06	2.20
1981/03/07	2.20
1981/03/08	2.20
1981/03/09	2.20
1981/03/10	2.20
1981/03/11	2.00
1981/03/12	2.00
1981/03/13	2.00
1981/03/14	2.00
1981/03/15	2.00
1981/03/16	2.00
1981/03/17	2.00
1981/03/18	2.00
1981/03/19	1.90
1981/03/20	1.90
1981/03/21	1.90
1981/03/22	1.80
1981/03/23	1.80
1981/03/24	1.80
1981/03/25	1.80
1981/03/26	1.80
1981/03/27	1.80
1981/03/28	1.80
1981/03/29	1.80
1981/03/30	1.80
1981/03/31	1.50
1981/04/01	0.75
1981/04/02	0.75
1981/04/03	0.75
1981/04/04	0.75
1981/04/05	0.75
1981/04/06	0.75
1981/04/07	0.75
1981/04/08	0.75
1981/04/09	0.75
1981/04/10	0.75
1981/04/11	0.75
1981/04/12	0.75
1981/04/13	0.75
1981/04/14	0.75
1981/04/15	0.75
1981/04/16	1.60
1981/04/17	1.40
1981/04/18	1.30
1981/04/19	1.20
1981/04/20	1.10
1981/04/21	1.00
1981/04/22	1.00
1981/04/23	0.90
1981/04/24	0.80
1981/04/25	0.80
1981/04/26	0.80
1981/04/27	1.30
1981/04/28	0.95
1981/04/29	0.90
1981/04/30	0.85
1981/05/01	0.95
1981/05/02	0.90
1981/05/03	0.90
1981/05/04	1.10
1981/05/05	8.60
1981/05/06	1.70
1981/05/07	1.20
1981/05/08	1.10
1981/05/09	1.10
1981/05/10	1.00
1981/05/11	1.60
1981/05/12	4.55
1981/05/13	1.00
1981/05/14	1.00
1981/05/15	0.90
1981/05/16	1.00
1981/05/17	1.50
1981/05/18	1.50
1981/05/19	9.80
1981/05/20	4.85
1981/05/21	2.30
1981/05/22	12.00
1981/05/23	13.25
1981/05/24	9.80
1981/05/25	24.00
1981/05/26	24.88
1981/05/27	14.00
1981/05/28	14.00
1981/05/29	12.60
1981/05/30	11.00
1981/05/31	11.20
1981/06/01	9.60
1981/06/02	10.60
1981/06/03	8.80
1981/06/04	7.60
1981/06/05	7.40
1981/06/06	7.20
1981/06/07	6.80
1981/06/08	6.80
1981/06/09	6.60
1981/06/10	7.00
1981/06/11	8.20
1981/06/12	6.60
1981/06/13	5.80
1981/06/14	6.00
1981/06/15	6.40
1981/06/16	6.20
1981/06/17	6.00
1981/06/18	12.60
1981/06/19	10.40
1981/06/20	8.60
1981/06/21	7.00
1981/06/22	7.00
1981/06/23	7.00
1981/06/24	6.60
1981/06/25	6.40
1981/06/26	6.20
1981/06/27	6.40
1981/06/28	8.00
1981/06/29	6.20
1981/06/30	5.80
1981/07/01	5.60
1981/07/02	5.40
1981/07/03	5.00
1981/07/04	5.00
1981/07/05	5.00
1981/07/06	5.00
1981/07/07	8.00
1981/07/08	6.80
1981/07/09	6.80
1981/07/10	6.20
1981/07/11	6.80
1981/07/12	6.80
1981/07/13	6.00
1981/07/14	6.00
1981/07/15	6.00
1981/07/16	6.00
1981/07/17	7.40
1981/07/18	6.20
1981/07/19	6.00
1981/07/20	6.00
1981/07/21	11.40
1981/07/22	9.00
1981/07/23	7.20
1981/07/24	7.00
1981/07/25	6.80
1981/07/26	6.20
1981/07/27	7.60
1981/07/28	7.20
1981/07/29	7.20
1981/07/30	6.80
1981/07/31	7.00
1981/08/01	8.40
1981/08/02	11.40
1981/08/03	8.60
1981/08/04	7.40
1981/08/05	7.80
1981/08/06	8.60
1981/08/07	13.75
1981/08/08	9.20
1981/08/09	8.00
1981/08/10	7.00
1981/08/11	9.60
1981/08/12	10.80
1981/08/13	9.20
1981/08/14	8.00
1981/08/15	7.60
1981/08/16	7.40
1981/08/17	7.00
1981/08/18	6.40
1981/08/19	6.80
1981/08/20	7.40
1981/08/21	7.80
1981/08/22	7.00
1981/08/23	9.20
1981/08/24	7.60
1981/08/25	6.80
1981/08/26	6.00
1981/08/27	6.20
1981/08/28	7.00
1981/08/29	6.80
1981/08/30	6.60
1981/08/31	6.20
1981/09/01	6.20
1981/09/02	9.20
1981/09/03	7.20
1981/09/04	6.80
1981/09/05	6.80
1981/09/06	7.00
1981/09/07	9.40
1981/09/08	8.60
1981/09/09	7.60
1981/09/10	7.80
1981/09/11	8.60
1981/09/12	8.00
1981/09/13	7.20
1981/09/14	6.60
1981/09/15	6.20
1981/09/16	6.00
1981/09/17	5.80
1981/09/18	5.60
1981/09/19	6.80
1981/09/20	11.40
1981/09/21	7.60
1981/09/22	7.00
1981/09/23	6.00
1981/09/24	6.60
1981/09/25	6.00
1981/09/26	5.80
1981/09/27	5.80
1981/09/28	6.00
1981/09/29	7.00
1981/09/30	7.80
1981/10/01	6.00
1981/10/02	6.00
1981/10/03	5.40
1981/10/04	6.40
1981/10/05	6.80
1981/10/06	6.40
1981/10/07	6.00
1981/10/08	7.80
1981/10/09	7.20
1981/10/10	6.00
1981/10/11	26.63
1981/10/12	9.60
1981/10/13	10.00
1981/10/14	13.50
1981/10/15	7.60
1981/10/16	7.00
1981/10/17	23.71
1981/10/18	21.96
1981/10/19	12.40
1981/10/20	10.60
1981/10/21	12.40
1981/10/22	9.40
1981/10/23	8.20
1981/10/24	7.80
1981/10/25	7.80
1981/10/26	7.80
1981/10/27	7.40
1981/10/28	7.20
1981/10/29	6.80
1981/10/30	6.80
1981/10/31	6.60
1981/11/01	6.40
1981/11/02	6.40
1981/11/03	6.40
1981/11/04	6.40
1981/11/05	6.40
1981/11/06	6.40
1981/11/07	6.20
1981/11/08	8.20
1981/11/09	13.25
1981/11/10	8.00
1981/11/11	7.20
1981/11/12	7.00
1981/11/13	6.80
1981/11/14	6.60
1981/11/15	7.40
1981/11/16	39.05
1981/11/17	24.88
1981/11/18	28.67
1981/11/19	43.25
1981/11/20	23.13
1981/11/21	21.96
1981/11/22	19.75
1981/11/23	18.00
1981/11/24	16.25
1981/11/25	14.50
1981/11/26	13.50
1981/11/27	11.20
1981/11/28	12.40
1981/11/29	12.60
1981/11/30	12.00
1981/12/01	9.00
1981/12/02	8.40
1981/12/03	8.40
1981/12/04	8.20
1981/12/05	8.00
1981/12/06	8.00
1981/12/07	7.80
1981/12/08	7.80
1981/12/09	7.60
1981/12/10	7.60
1981/12/11	8.00
1981/12/12	7.80
1981/12/13	7.60
1981/12/14	9.00
1981/12/15	9.00
1981/12/16	7.80
1981/12/17	7.60
1981/12/18	7.60
1981/12/19	7.40
1981/12/20	6.80
1981/12/21	6.60
1981/12/22	6.60
1981/12/23	6.60
1981/12/24	6.40
1981/12/25	6.40
1981/12/26	6.20
1981/12/27	6.20
1981/12/28	6.00
1981/12/29	6.00
1981/12/30	6.00
1981/12/31	5.80
#===========================================
# Number of observations = 365 / 365
# Average = 6.28