1981/01/01	7.30
1981/01/02	6.30
1981/01/03	2.20
1981/01/04	2.10
1981/01/05	1.70
1981/01/06	0.70
1981/01/07	0.40
1981/01/08	0.40
1981/01/09	0.30
1981/01/10	0.20
1981/01/11	0.10
1981/01/12	0.20
1981/01/13	0.30
1981/01/14	0.20
1981/01/15	0.20
1981/01/16	0.10
1981/01/17	0
1981/01/18	0.40
1981/01/19	0.10
1981/01/20	0.30
1981/01/21	0.20
1981/01/22	0.20
1981/01/23	0.10
1981/01/24	0.10
1981/01/25	0.10
1981/01/26	0.20
1981/01/27	0.20
1981/01/28	0.10
1981/01/29	0.10
1981/01/30	0
1981/01/31	0
1981/02/01	0
1981/02/02	0
1981/02/03	0
1981/02/04	0
1981/02/05	0
1981/02/06	0
1981/02/07	0
1981/02/08	0
1981/02/09	0
1981/02/10	0
1981/02/11	0
1981/02/12	0
1981/02/13	0
1981/02/14	0
1981/02/15	0
1981/02/16	0
1981/02/17	0
1981/02/18	0
1981/02/19	0
1981/02/20	0
1981/02/21	0
1981/02/22	0
1981/02/23	0
1981/02/24	0
1981/02/25	0
1981/02/26	0
1981/02/27	0
1981/02/28	0
1981/03/01	0
1981/03/02	0
1981/03/03	0.90
1981/03/04	0
1981/03/05	0
1981/03/06	0
1981/03/07	0
1981/03/08	0
1981/03/09	0
1981/03/10	0
1981/03/11	0
1981/03/12	0
1981/03/13	0
1981/03/14	0
1981/03/15	0
1981/03/16	0
1981/03/17	0
1981/03/18	0
1981/03/19	0
1981/03/20	0
1981/03/21	0
1981/03/22	0
1981/03/23	0
1981/03/24	0
1981/03/25	0
1981/03/26	0
1981/03/27	0
1981/03/28	0
1981/03/29	0.20
1981/03/30	0
1981/03/31	0
1981/04/01	0.86
1981/04/02	0.84
1981/04/03	0.84
1981/04/04	0.84
1981/04/05	0.86
1981/04/06	0.86
1981/04/07	0.86
1981/04/08	0.84
1981/04/09	0.86
1981/04/10	0.89
1981/04/11	0.87
1981/04/12	0.86
1981/04/13	0.84
1981/04/14	0.86
1981/04/15	0.86
1981/04/16	0.89
1981/04/17	0.86
1981/04/18	0.84
1981/04/19	0.84
1981/04/20	0.84
1981/04/21	0.84
1981/04/22	0.84
1981/04/23	0.83
1981/04/24	0.83
1981/04/25	0.83
1981/04/26	0.83
1981/04/27	0.84
1981/04/28	0.83
1981/04/29	0.83
1981/04/30	0.83
1981/05/01	0.83
1981/05/02	0.83
1981/05/03	0.83
1981/05/04	0.84
1981/05/05	0.91
1981/05/06	3.30
1981/05/07	3.10
1981/05/08	0.91
1981/05/09	0.87
1981/05/10	0.87
1981/05/11	0.86
1981/05/12	0.84
1981/05/13	0.86
1981/05/14	0.89
1981/05/15	0.86
1981/05/16	0.84
1981/05/17	0.83
1981/05/18	0.83
1981/05/19	1.90
1981/05/20	26.40
1981/05/21	31.30
1981/05/22	64.70
1981/05/23	36.55
1981/05/24	49.00
1981/05/25	36.55
1981/05/26	79.40
1981/05/27	39.50
1981/05/28	29.30
1981/05/29	27.80
1981/05/30	20.20
1981/05/31	17.00
1981/06/01	15.25
1981/06/02	24.40
1981/06/03	24.40
1981/06/04	18.75
1981/06/05	16.75
1981/06/06	14.25
1981/06/07	12.00
1981/06/08	15.00
1981/06/09	22.60
1981/06/10	20.20
1981/06/11	19.90
1981/06/12	18.25
1981/06/13	15.75
1981/06/14	16.50
1981/06/15	18.50
1981/06/16	18.25
1981/06/17	19.60
1981/06/18	20.80
1981/06/19	20.80
1981/06/20	16.00
1981/06/21	19.00
1981/06/22	19.90
1981/06/23	17.00
1981/06/24	14.25
1981/06/25	13.75
1981/06/26	13.00
1981/06/27	11.25
1981/06/28	10.75
1981/06/29	5.65
1981/06/30	1.80
1981/07/01	1.50
1981/07/02	1.20
1981/07/03	1.10
1981/07/04	1.10
1981/07/05	1.20
1981/07/06	1.20
1981/07/07	50.00
1981/07/08	21.10
1981/07/09	10.50
1981/07/10	6.10
1981/07/11	4.75
1981/07/12	6.85
1981/07/13	3.40
1981/07/14	2.30
1981/07/15	2.20
1981/07/16	1.40
1981/07/17	7.60
1981/07/18	12.25
1981/07/19	6.55
1981/07/20	13.75
1981/07/21	28.90
1981/07/22	32.95
1981/07/23	21.40
1981/07/24	11.75
1981/07/25	13.00
1981/07/26	19.60
1981/07/27	14.50
1981/07/28	15.50
1981/07/29	17.25
1981/07/30	18.50
1981/07/31	27.10
1981/08/01	35.20
1981/08/02	62.80
1981/08/03	57.40
1981/08/04	35.20
1981/08/05	32.10
1981/08/06	44.50
1981/08/07	22.60
1981/08/08	23.80
1981/08/09	26.40
1981/08/10	29.30
1981/08/11	47.50
1981/08/12	110.80
1981/08/13	91.30
1981/08/14	23.80
1981/08/15	37.00
1981/08/16	33.40
1981/08/17	27.45
1981/08/18	24.10
1981/08/19	24.70
1981/08/20	28.50
1981/08/21	29.70
1981/08/22	39.00
1981/08/23	27.10
1981/08/24	21.10
1981/08/25	17.00
1981/08/26	14.50
1981/08/27	13.00
1981/08/28	13.25
1981/08/29	15.00
1981/08/30	13.00
1981/08/31	11.25
1981/09/01	11.75
1981/09/02	33.85
1981/09/03	40.50
1981/09/04	22.60
1981/09/05	20.50
1981/09/06	22.90
1981/09/07	33.85
1981/09/08	37.50
1981/09/09	38.00
1981/09/10	33.85
1981/09/11	32.50
1981/09/12	30.90
1981/09/13	24.40
1981/09/14	20.20
1981/09/15	14.75
1981/09/16	12.50
1981/09/17	12.00
1981/09/18	12.25
1981/09/19	12.00
1981/09/20	9.75
1981/09/21	9.25
1981/09/22	8.20
1981/09/23	6.70
1981/09/24	7.20
1981/09/25	11.75
1981/09/26	10.75
1981/09/27	8.00
1981/09/28	14.50
1981/09/29	17.25
1981/09/30	14.25
1981/10/01	11.00
1981/10/02	8.00
1981/10/03	7.00
1981/10/04	7.80
1981/10/05	13.75
1981/10/06	7.60
1981/10/07	9.25
1981/10/08	14.50
1981/10/09	36.55
1981/10/10	77.30
1981/10/11	42.00
1981/10/12	24.70
1981/10/13	20.80
1981/10/14	20.80
1981/10/15	20.20
1981/10/16	19.00
1981/10/17	18.75
1981/10/18	19.60
1981/10/19	19.30
1981/10/20	16.75
1981/10/21	12.25
1981/10/22	12.25
1981/10/23	14.00
1981/10/24	16.25
1981/10/25	18.25
1981/10/26	20.50
1981/10/27	20.20
1981/10/28	16.75
1981/10/29	14.50
1981/10/30	12.25
1981/10/31	12.25
1981/11/01	12.25
1981/11/02	12.25
1981/11/03	12.00
1981/11/04	10.75
1981/11/05	11.25
1981/11/06	9.75
1981/11/07	9.75
1981/11/08	10.00
1981/11/09	32.95
1981/11/10	31.70
1981/11/11	20.20
1981/11/12	19.30
1981/11/13	20.20
1981/11/14	20.20
1981/11/15	20.20
1981/11/16	24.70
1981/11/17	54.40
1981/11/18	45.00
1981/11/19	59.20
1981/11/20	44.50
1981/11/21	36.55
1981/11/22	33.40
1981/11/23	32.10
1981/11/24	30.90
1981/11/25	30.50
1981/11/26	28.90
1981/11/27	25.00
1981/11/28	23.20
1981/11/29	23.20
1981/11/30	23.20
1981/12/01	24.10
1981/12/02	21.70
1981/12/03	21.70
1981/12/04	21.70
1981/12/05	21.70
1981/12/06	21.40
1981/12/07	21.40
1981/12/08	21.70
1981/12/09	21.70
1981/12/10	18.75
1981/12/11	18.75
1981/12/12	18.75
1981/12/13	18.75
1981/12/14	18.75
1981/12/15	18.75
1981/12/16	20.20
1981/12/17	19.00
1981/12/18	19.90
1981/12/19	18.75
1981/12/20	18.75
1981/12/21	17.50
1981/12/22	16.25
1981/12/23	17.50
1981/12/24	17.50
1981/12/25	17.50
1981/12/26	17.50
1981/12/27	17.50
1981/12/28	17.50
1981/12/29	16.25
1981/12/30	16.25
1981/12/31	15.00
#===========================================
# Number of observations = 365 / 365
# Average = 13.59