1981/01/01	5.20
1981/01/02	5.20
1981/01/03	5.00
1981/01/04	5.00
1981/01/05	5.00
1981/01/06	5.00
1981/01/07	5.00
1981/01/08	5.00
1981/01/09	4.80
1981/01/10	4.80
1981/01/11	4.80
1981/01/12	4.60
1981/01/13	4.60
1981/01/14	4.60
1981/01/15	4.20
1981/01/16	4.00
1981/01/17	4.00
1981/01/18	3.70
1981/01/19	3.70
1981/01/20	3.70
1981/01/21	3.55
1981/01/22	3.55
1981/01/23	3.40
1981/01/24	3.40
1981/01/25	3.40
1981/01/26	3.25
1981/01/27	2.95
1981/01/28	2.80
1981/01/29	2.65
1981/01/30	2.65
1981/01/31	2.50
1981/02/01	2.50
1981/02/02	2.30
1981/02/03	2.20
1981/02/04	2.20
1981/02/05	2.30
1981/02/06	2.10
1981/02/07	2.50
1981/02/08	2.50
1981/02/09	2.40
1981/02/10	2.30
1981/02/11	2.40
1981/02/12	2.50
1981/02/13	2.50
1981/02/14	2.50
1981/02/15	2.40
1981/02/16	2.30
1981/02/17	2.20
1981/02/18	2.20
1981/02/19	2.20
1981/02/20	2.20
1981/02/21	2.40
1981/02/22	2.30
1981/02/23	2.30
1981/02/24	2.20
1981/02/25	2.20
1981/02/26	2.20
1981/02/27	2.20
1981/02/28	2.10
1981/03/01	2.20
1981/03/02	2.30
1981/03/03	2.30
1981/03/04	2.10
1981/03/05	1.80
1981/03/06	1.80
1981/03/07	1.80
1981/03/08	1.90
1981/03/09	2.10
1981/03/10	1.90
1981/03/11	1.90
1981/03/12	3.10
1981/03/13	2.80
1981/03/14	2.30
1981/03/15	2.20
1981/03/16	2.10
1981/03/17	2.00
1981/03/18	2.00
1981/03/19	1.80
1981/03/20	1.70
1981/03/21	1.80
1981/03/22	1.70
1981/03/23	1.70
1981/03/24	1.60
1981/03/25	1.50
1981/03/26	1.50
1981/03/27	1.50
1981/03/28	1.50
1981/03/29	1.40
1981/03/30	1.40
1981/03/31	1.30
1981/04/01	0.90
1981/04/02	0.95
1981/04/03	1.00
1981/04/04	1.00
1981/04/05	1.00
1981/04/06	0.90
1981/04/07	0.90
1981/04/08	0.90
1981/04/09	0.90
1981/04/10	0.90
1981/04/11	0.95
1981/04/12	1.15
1981/04/13	1.60
1981/04/14	2.90
1981/04/15	4.70
1981/04/16	4.10
1981/04/17	3.90
1981/04/18	3.70
1981/04/19	3.10
1981/04/20	2.90
1981/04/21	2.50
1981/04/22	2.70
1981/04/23	2.50
1981/04/24	2.20
1981/04/25	2.05
1981/04/26	1.75
1981/04/27	2.20
1981/04/28	5.30
1981/04/29	5.10
1981/04/30	4.70
1981/05/01	4.90
1981/05/02	4.50
1981/05/03	5.50
1981/05/04	4.90
1981/05/05	4.90
1981/05/06	5.30
1981/05/07	4.50
1981/05/08	3.90
1981/05/09	3.70
1981/05/10	4.30
1981/05/11	4.30
1981/05/12	4.30
1981/05/13	4.10
1981/05/14	3.50
1981/05/15	3.10
1981/05/16	2.50
1981/05/17	2.50
1981/05/18	2.50
1981/05/19	3.30
1981/05/20	3.50
1981/05/21	3.70
1981/05/22	3.70
1981/05/23	3.70
1981/05/24	4.30
1981/05/25	4.30
1981/05/26	4.10
1981/05/27	6.10
1981/05/28	10.20
1981/05/29	9.30
1981/05/30	7.50
1981/05/31	6.30
1981/06/01	6.10
1981/06/02	6.10
1981/06/03	7.00
1981/06/04	5.90
1981/06/05	5.70
1981/06/06	5.50
1981/06/07	5.90
1981/06/08	6.50
1981/06/09	7.00
1981/06/10	6.75
1981/06/11	6.30
1981/06/12	5.70
1981/06/13	5.70
1981/06/14	5.70
1981/06/15	6.30
1981/06/16	5.70
1981/06/17	5.70
1981/06/18	5.50
1981/06/19	5.50
1981/06/20	5.50
1981/06/21	5.30
1981/06/22	5.10
1981/06/23	4.90
1981/06/24	4.70
1981/06/25	4.50
1981/06/26	5.30
1981/06/27	5.90
1981/06/28	7.75
1981/06/29	6.30
1981/06/30	4.90
1981/07/01	4.70
1981/07/02	4.70
1981/07/03	4.50
1981/07/04	3.90
1981/07/05	3.70
1981/07/06	5.70
1981/07/07	5.10
1981/07/08	8.00
1981/07/09	8.50
1981/07/10	8.50
1981/07/11	7.00
1981/07/12	6.50
1981/07/13	5.90
1981/07/14	5.30
1981/07/15	5.30
1981/07/16	5.70
1981/07/17	6.75
1981/07/18	9.30
1981/07/19	7.25
1981/07/20	6.10
1981/07/21	5.70
1981/07/22	15.60
1981/07/23	10.50
1981/07/24	9.00
1981/07/25	18.00
1981/07/26	12.40
1981/07/27	12.00
1981/07/28	15.20
1981/07/29	11.40
1981/07/30	8.75
1981/07/31	11.40
1981/08/01	11.10
1981/08/02	14.80
1981/08/03	9.60
1981/08/04	8.50
1981/08/05	22.50
1981/08/06	22.00
1981/08/07	16.50
1981/08/08	15.60
1981/08/09	19.00
1981/08/10	12.80
1981/08/11	9.90
1981/08/12	10.80
1981/08/13	11.40
1981/08/14	10.50
1981/08/15	13.20
1981/08/16	26.00
1981/08/17	15.60
1981/08/18	12.40
1981/08/19	14.80
1981/08/20	12.40
1981/08/21	10.50
1981/08/22	9.90
1981/08/23	9.30
1981/08/24	8.25
1981/08/25	7.00
1981/08/26	6.30
1981/08/27	5.90
1981/08/28	8.50
1981/08/29	8.75
1981/08/30	7.25
1981/08/31	6.10
1981/09/01	5.50
1981/09/02	6.50
1981/09/03	10.50
1981/09/04	15.60
1981/09/05	10.80
1981/09/06	18.50
1981/09/07	22.50
1981/09/08	18.00
1981/09/09	15.60
1981/09/10	16.00
1981/09/11	12.80
1981/09/12	9.00
1981/09/13	7.50
1981/09/14	6.50
1981/09/15	6.10
1981/09/16	5.70
1981/09/17	5.10
1981/09/18	5.30
1981/09/19	5.10
1981/09/20	5.90
1981/09/21	14.00
1981/09/22	30.10
1981/09/23	16.50
1981/09/24	15.20
1981/09/25	18.50
1981/09/26	15.60
1981/09/27	20.50
1981/09/28	17.00
1981/09/29	16.50
1981/09/30	16.50
1981/10/01	14.40
1981/10/02	12.40
1981/10/03	12.00
1981/10/04	17.00
1981/10/05	19.50
1981/10/06	16.00
1981/10/07	12.40
1981/10/08	11.10
1981/10/09	10.80
1981/10/10	22.50
1981/10/11	19.00
1981/10/12	12.80
1981/10/13	13.20
1981/10/14	14.80
1981/10/15	14.00
1981/10/16	11.70
1981/10/17	16.50
1981/10/18	47.01
1981/10/19	45.48
1981/10/20	36.76
1981/10/21	30.10
1981/10/22	24.50
1981/10/23	19.00
1981/10/24	14.80
1981/10/25	12.40
1981/10/26	10.80
1981/10/27	9.90
1981/10/28	8.75
1981/10/29	8.50
1981/10/30	9.90
1981/10/31	9.00
1981/11/01	7.75
1981/11/02	7.00
1981/11/03	9.00
1981/11/04	15.60
1981/11/05	10.50
1981/11/06	8.75
1981/11/07	21.00
1981/11/08	312.20
1981/11/09	230.00
1981/11/10	93.30
1981/11/11	61.36
1981/11/12	48.04
1981/11/13	39.33
1981/11/14	34.71
1981/11/15	39.84
1981/11/16	39.84
1981/11/17	50.09
1981/11/18	128.40
1981/11/19	142.80
1981/11/20	74.40
1981/11/21	55.21
1981/11/22	44.45
1981/11/23	37.28
1981/11/24	32.15
1981/11/25	28.05
1981/11/26	24.50
1981/11/27	22.50
1981/11/28	22.50
1981/11/29	19.50
1981/11/30	17.00
1981/12/01	14.80
1981/12/02	13.60
1981/12/03	12.80
1981/12/04	12.40
1981/12/05	11.40
1981/12/06	10.50
1981/12/07	9.60
1981/12/08	9.00
1981/12/09	8.75
1981/12/10	8.25
1981/12/11	8.25
1981/12/12	8.25
1981/12/13	7.75
1981/12/14	7.50
1981/12/15	7.25
1981/12/16	7.00
1981/12/17	6.75
1981/12/18	6.75
1981/12/19	6.75
1981/12/20	6.30
1981/12/21	6.10
1981/12/22	5.90
1981/12/23	5.90
1981/12/24	5.70
1981/12/25	5.30
1981/12/26	4.70
1981/12/27	4.70
1981/12/28	4.50
1981/12/29	4.50
1981/12/30	4.30
1981/12/31	4.30
#===========================================
# Number of observations = 365 / 365
# Average = 11.26