1981/01/01	2.35
1981/01/02	2.28
1981/01/03	2.28
1981/01/04	2.28
1981/01/05	2.20
1981/01/06	2.20
1981/01/07	2.13
1981/01/08	2.05
1981/01/09	1.98
1981/01/10	1.98
1981/01/11	1.90
1981/01/12	1.90
1981/01/13	1.98
1981/01/14	1.90
1981/01/15	1.75
1981/01/16	1.75
1981/01/17	1.68
1981/01/18	1.68
1981/01/19	1.68
1981/01/20	1.68
1981/01/21	1.60
1981/01/22	1.60
1981/01/23	1.53
1981/01/24	1.45
1981/01/25	1.45
1981/01/26	1.45
1981/01/27	1.45
1981/01/28	1.45
1981/01/29	1.38
1981/01/30	1.45
1981/01/31	1.30
1981/02/01	1.38
1981/02/02	1.23
1981/02/03	1.15
1981/02/04	1.30
1981/02/05	1.08
1981/02/06	1.15
1981/02/07	1.30
1981/02/08	1.23
1981/02/09	1.30
1981/02/10	1.23
1981/02/11	1.08
1981/02/12	1.15
1981/02/13	1.08
1981/02/14	1.00
1981/02/15	0.95
1981/02/16	0.85
1981/02/17	0.85
1981/02/18	1.08
1981/02/19	0.95
1981/02/20	0.95
1981/02/21	0.85
1981/02/22	0.85
1981/02/23	1.00
1981/02/24	1.15
1981/02/25	1.08
1981/02/26	0.95
1981/02/27	0.85
1981/02/28	0.95
1981/03/01	1.08
1981/03/02	1.08
1981/03/03	1.00
1981/03/04	1.00
1981/03/05	0.95
1981/03/06	1.38
1981/03/07	1.38
1981/03/08	1.53
1981/03/09	1.45
1981/03/10	1.23
1981/03/11	1.38
1981/03/12	1.45
1981/03/13	1.30
1981/03/14	1.15
1981/03/15	1.08
1981/03/16	1.08
1981/03/17	0.95
1981/03/18	0.90
1981/03/19	0.85
1981/03/20	0.85
1981/03/21	0.80
1981/03/22	0.70
1981/03/23	0.75
1981/03/24	0.75
1981/03/25	0.75
1981/03/26	0.80
1981/03/27	0.75
1981/03/28	0.70
1981/03/29	0.70
1981/03/30	0.65
1981/03/31	0.65
1981/04/01	1.20
1981/04/02	1.52
1981/04/03	1.36
1981/04/04	1.20
1981/04/05	1.20
1981/04/06	1.04
1981/04/07	0.88
1981/04/08	0.88
1981/04/09	1.04
1981/04/10	0.88
1981/04/11	1.04
1981/04/12	1.20
1981/04/13	2.00
1981/04/14	2.40
1981/04/15	2.30
1981/04/16	2.40
1981/04/17	2.50
1981/04/18	2.20
1981/04/19	2.10
1981/04/20	2.10
1981/04/21	2.00
1981/04/22	2.10
1981/04/23	2.00
1981/04/24	1.84
1981/04/25	1.52
1981/04/26	1.52
1981/04/27	2.60
1981/04/28	2.50
1981/04/29	2.10
1981/04/30	2.20
1981/05/01	2.50
1981/05/02	2.50
1981/05/03	2.30
1981/05/04	2.10
1981/05/05	2.60
1981/05/06	3.10
1981/05/07	2.90
1981/05/08	2.60
1981/05/09	2.30
1981/05/10	2.30
1981/05/11	2.30
1981/05/12	2.10
1981/05/13	2.00
1981/05/14	1.84
1981/05/15	1.68
1981/05/16	1.52
1981/05/17	1.36
1981/05/18	1.20
1981/05/19	1.36
1981/05/20	1.84
1981/05/21	2.10
1981/05/22	2.70
1981/05/23	3.00
1981/05/24	3.30
1981/05/25	3.90
1981/05/26	6.00
1981/05/27	8.20
1981/05/28	7.20
1981/05/29	7.00
1981/05/30	5.80
1981/05/31	5.40
1981/06/01	4.20
1981/06/02	4.40
1981/06/03	5.60
1981/06/04	6.40
1981/06/05	6.60
1981/06/06	6.00
1981/06/07	5.00
1981/06/08	3.90
1981/06/09	3.30
1981/06/10	3.00
1981/06/11	2.80
1981/06/12	2.70
1981/06/13	2.60
1981/06/14	2.50
1981/06/15	2.50
1981/06/16	2.40
1981/06/17	2.40
1981/06/18	2.40
1981/06/19	2.70
1981/06/20	2.80
1981/06/21	3.70
1981/06/22	6.20
1981/06/23	4.20
1981/06/24	3.40
1981/06/25	4.80
1981/06/26	5.60
1981/06/27	5.80
1981/06/28	5.60
1981/06/29	5.00
1981/06/30	4.20
1981/07/01	3.60
1981/07/02	3.10
1981/07/03	3.00
1981/07/04	2.70
1981/07/05	2.50
1981/07/06	2.70
1981/07/07	3.40
1981/07/08	3.60
1981/07/09	3.60
1981/07/10	3.60
1981/07/11	3.80
1981/07/12	3.90
1981/07/13	3.50
1981/07/14	3.30
1981/07/15	3.50
1981/07/16	3.90
1981/07/17	4.00
1981/07/18	4.80
1981/07/19	5.00
1981/07/20	5.00
1981/07/21	6.20
1981/07/22	6.80
1981/07/23	6.80
1981/07/24	7.20
1981/07/25	9.80
1981/07/26	10.20
1981/07/27	13.50
1981/07/28	14.70
1981/07/29	19.50
1981/07/30	17.70
1981/07/31	15.30
1981/08/01	12.90
1981/08/02	11.00
1981/08/03	9.80
1981/08/04	9.60
1981/08/05	12.60
1981/08/06	14.70
1981/08/07	14.70
1981/08/08	12.90
1981/08/09	10.80
1981/08/10	9.20
1981/08/11	8.00
1981/08/12	7.00
1981/08/13	6.40
1981/08/14	6.60
1981/08/15	7.40
1981/08/16	8.40
1981/08/17	10.00
1981/08/18	9.60
1981/08/19	8.60
1981/08/20	7.20
1981/08/21	6.40
1981/08/22	6.40
1981/08/23	6.20
1981/08/24	5.80
1981/08/25	5.60
1981/08/26	5.00
1981/08/27	5.80
1981/08/28	6.60
1981/08/29	10.40
1981/08/30	12.90
1981/08/31	11.60
1981/09/01	10.60
1981/09/02	9.00
1981/09/03	7.60
1981/09/04	6.60
1981/09/05	5.80
1981/09/06	6.60
1981/09/07	7.20
1981/09/08	8.40
1981/09/09	10.60
1981/09/10	12.00
1981/09/11	13.80
1981/09/12	15.00
1981/09/13	13.50
1981/09/14	10.80
1981/09/15	8.40
1981/09/16	6.80
1981/09/17	9.80
1981/09/18	17.70
1981/09/19	21.30
1981/09/20	40.50
1981/09/21	46.00
1981/09/22	31.00
1981/09/23	25.20
1981/09/24	24.60
1981/09/25	33.00
1981/09/26	29.40
1981/09/27	25.20
1981/09/28	20.70
1981/09/29	19.80
1981/09/30	26.10
1981/10/01	22.80
1981/10/02	18.90
1981/10/03	16.20
1981/10/04	19.20
1981/10/05	17.10
1981/10/06	15.60
1981/10/07	14.40
1981/10/08	12.90
1981/10/09	12.90
1981/10/10	26.70
1981/10/11	45.50
1981/10/12	30.00
1981/10/13	26.40
1981/10/14	24.60
1981/10/15	21.30
1981/10/16	20.10
1981/10/17	28.20
1981/10/18	37.50
1981/10/19	38.50
1981/10/20	30.50
1981/10/21	29.10
1981/10/22	26.40
1981/10/23	22.50
1981/10/24	19.50
1981/10/25	16.50
1981/10/26	14.70
1981/10/27	12.60
1981/10/28	11.20
1981/10/29	10.80
1981/10/30	10.40
1981/10/31	10.00
1981/11/01	9.20
1981/11/02	9.00
1981/11/03	8.40
1981/11/04	9.00
1981/11/05	10.00
1981/11/06	10.80
1981/11/07	27.60
1981/11/08	416.00
1981/11/09	256.00
1981/11/10	150.00
1981/11/11	89.20
1981/11/12	58.40
1981/11/13	42.00
1981/11/14	37.50
1981/11/15	35.00
1981/11/16	32.50
1981/11/17	52.80
1981/11/18	191.00
1981/11/19	161.00
1981/11/20	120.00
1981/11/21	85.00
1981/11/22	61.20
1981/11/23	47.00
1981/11/24	37.50
1981/11/25	30.00
1981/11/26	27.00
1981/11/27	25.50
1981/11/28	24.60
1981/11/29	22.20
1981/11/30	20.70
1981/12/01	18.90
1981/12/02	16.50
1981/12/03	14.70
1981/12/04	13.50
1981/12/05	12.30
1981/12/06	11.60
1981/12/07	11.20
1981/12/08	10.60
1981/12/09	10.00
1981/12/10	9.60
1981/12/11	9.40
1981/12/12	9.20
1981/12/13	9.00
1981/12/14	8.60
1981/12/15	8.20
1981/12/16	7.60
1981/12/17	7.40
1981/12/18	7.00
1981/12/19	6.60
1981/12/20	6.40
1981/12/21	6.00
1981/12/22	5.80
1981/12/23	5.60
1981/12/24	5.40
1981/12/25	5.20
1981/12/26	5.00
1981/12/27	4.80
1981/12/28	4.60
1981/12/29	4.40
1981/12/30	4.20
1981/12/31	4.00
#===========================================
# Number of observations = 365 / 365
# Average = 12.12