1981/01/01	14.50
1981/01/02	13.90
1981/01/03	12.70
1981/01/04	12.10
1981/01/05	11.20
1981/01/06	11.20
1981/01/07	11.20
1981/01/08	11.20
1981/01/09	10.90
1981/01/10	10.60
1981/01/11	9.60
1981/01/12	9.00
1981/01/13	8.60
1981/01/14	8.80
1981/01/15	9.60
1981/01/16	9.40
1981/01/17	9.40
1981/01/18	9.20
1981/01/19	9.00
1981/01/20	9.00
1981/01/21	8.60
1981/01/22	8.40
1981/01/23	8.80
1981/01/24	9.00
1981/01/25	9.40
1981/01/26	9.20
1981/01/27	9.20
1981/01/28	9.00
1981/01/29	9.00
1981/01/30	8.80
1981/01/31	8.60
1981/02/01	8.40
1981/02/02	8.40
1981/02/03	8.40
1981/02/04	8.20
1981/02/05	7.80
1981/02/06	6.60
1981/02/07	6.60
1981/02/08	6.40
1981/02/09	6.00
1981/02/10	5.60
1981/02/11	5.40
1981/02/12	6.20
1981/02/13	6.00
1981/02/14	5.80
1981/02/15	5.80
1981/02/16	5.60
1981/02/17	5.20
1981/02/18	5.00
1981/02/19	5.00
1981/02/20	4.40
1981/02/21	4.20
1981/02/22	4.00
1981/02/23	3.80
1981/02/24	3.60
1981/02/25	3.60
1981/02/26	3.40
1981/02/27	3.20
1981/02/28	3.00
1981/03/01	2.60
1981/03/02	2.40
1981/03/03	2.40
1981/03/04	2.40
1981/03/05	2.40
1981/03/06	2.40
1981/03/07	2.20
1981/03/08	2.20
1981/03/09	2.20
1981/03/10	2.20
1981/03/11	2.40
1981/03/12	2.60
1981/03/13	2.40
1981/03/14	2.40
1981/03/15	2.40
1981/03/16	2.40
1981/03/17	2.20
1981/03/18	2.00
1981/03/19	1.90
1981/03/20	1.80
1981/03/21	1.80
1981/03/22	1.80
1981/03/23	1.90
1981/03/24	1.90
1981/03/25	1.90
1981/03/26	2.00
1981/03/27	2.00
1981/03/28	2.20
1981/03/29	2.20
1981/03/30	2.40
1981/03/31	2.80
1981/04/01	1.18
1981/04/02	1.22
1981/04/03	1.26
1981/04/04	1.18
1981/04/05	1.18
1981/04/06	0.94
1981/04/07	0.82
1981/04/08	0.58
1981/04/09	0.62
1981/04/10	0.66
1981/04/11	0.66
1981/04/12	0.66
1981/04/13	0.62
1981/04/14	0.50
1981/04/15	0.41
1981/04/16	0.78
1981/04/17	0.70
1981/04/18	0.12
1981/04/19	0.50
1981/04/20	0.86
1981/04/21	0.94
1981/04/22	0.90
1981/04/23	0.82
1981/04/24	0.78
1981/04/25	0.78
1981/04/26	0.90
1981/04/27	1.14
1981/04/28	1.22
1981/04/29	1.14
1981/04/30	1.10
1981/05/01	1.10
1981/05/02	1.10
1981/05/03	1.14
1981/05/04	1.30
1981/05/05	13.40
1981/05/06	23.90
1981/05/07	11.45
1981/05/08	9.00
1981/05/09	6.60
1981/05/10	6.00
1981/05/11	5.40
1981/05/12	3.60
1981/05/13	3.50
1981/05/14	3.40
1981/05/15	3.00
1981/05/16	2.40
1981/05/17	2.00
1981/05/18	2.60
1981/05/19	10.05
1981/05/20	23.30
1981/05/21	16.55
1981/05/22	12.15
1981/05/23	39.40
1981/05/24	43.00
1981/05/25	69.00
1981/05/26	103.80
1981/05/27	88.50
1981/05/28	26.90
1981/05/29	23.90
1981/05/30	22.10
1981/05/31	19.25
1981/06/01	16.10
1981/06/02	20.60
1981/06/03	19.70
1981/06/04	16.55
1981/06/05	14.75
1981/06/06	12.95
1981/06/07	10.75
1981/06/08	8.70
1981/06/09	14.30
1981/06/10	16.55
1981/06/11	24.50
1981/06/12	15.65
1981/06/13	3.10
1981/06/14	1.93
1981/06/15	1.26
1981/06/16	0.98
1981/06/17	0.82
1981/06/18	1.22
1981/06/19	30.30
1981/06/20	6.60
1981/06/21	4.20
1981/06/22	2.30
1981/06/23	1.79
1981/06/24	1.06
1981/06/25	0.82
1981/06/26	0.82
1981/06/27	1.02
1981/06/28	2.70
1981/06/29	2.60
1981/06/30	1.72
1981/07/01	0.66
1981/07/02	0.44
1981/07/03	0.23
1981/07/04	0.82
1981/07/05	1.51
1981/07/06	2.70
1981/07/07	5.60
1981/07/08	5.80
1981/07/09	5.60
1981/07/10	5.00
1981/07/11	3.30
1981/07/12	3.00
1981/07/13	3.20
1981/07/14	3.10
1981/07/15	2.80
1981/07/16	1.65
1981/07/17	2.00
1981/07/18	10.40
1981/07/19	7.20
1981/07/20	6.60
1981/07/21	11.80
1981/07/22	95.85
1981/07/23	20.60
1981/07/24	13.85
1981/07/25	22.70
1981/07/26	17.00
1981/07/27	11.45
1981/07/28	11.45
1981/07/29	12.15
1981/07/30	12.50
1981/07/31	13.85
1981/08/01	18.35
1981/08/02	35.90
1981/08/03	44.50
1981/08/04	24.50
1981/08/05	22.70
1981/08/06	22.70
1981/08/07	33.10
1981/08/08	40.80
1981/08/09	31.00
1981/08/10	26.90
1981/08/11	17.00
1981/08/12	95.85
1981/08/13	78.00
1981/08/14	63.00
1981/08/15	22.10
1981/08/16	20.15
1981/08/17	12.95
1981/08/18	12.50
1981/08/19	13.40
1981/08/20	25.70
1981/08/21	22.70
1981/08/22	19.70
1981/08/23	19.70
1981/08/24	17.90
1981/08/25	14.75
1981/08/26	11.10
1981/08/27	7.80
1981/08/28	7.50
1981/08/29	7.20
1981/08/30	7.20
1981/08/31	6.60
1981/09/01	6.00
1981/09/02	76.00
1981/09/03	31.00
1981/09/04	28.20
1981/09/05	25.10
1981/09/06	22.70
1981/09/07	37.30
1981/09/08	44.50
1981/09/09	33.10
1981/09/10	42.25
1981/09/11	35.20
1981/09/12	31.70
1981/09/13	22.10
1981/09/14	17.00
1981/09/15	12.95
1981/09/16	9.35
1981/09/17	7.50
1981/09/18	6.60
1981/09/19	5.80
1981/09/20	12.50
1981/09/21	32.40
1981/09/22	19.25
1981/09/23	14.30
1981/09/24	13.85
1981/09/25	12.15
1981/09/26	11.45
1981/09/27	11.45
1981/09/28	9.35
1981/09/29	7.80
1981/09/30	8.40
1981/10/01	9.70
1981/10/02	9.70
1981/10/03	7.80
1981/10/04	3.00
1981/10/05	7.50
1981/10/06	7.50
1981/10/07	5.00
1981/10/08	3.50
1981/10/09	6.30
1981/10/10	9.35
1981/10/11	31.00
1981/10/12	42.25
1981/10/13	25.10
1981/10/14	19.70
1981/10/15	18.80
1981/10/16	12.50
1981/10/17	19.70
1981/10/18	40.80
1981/10/19	64.00
1981/10/20	38.70
1981/10/21	36.60
1981/10/22	26.90
1981/10/23	17.00
1981/10/24	19.70
1981/10/25	15.20
1981/10/26	13.85
1981/10/27	11.45
1981/10/28	9.70
1981/10/29	7.20
1981/10/30	6.00
1981/10/31	5.60
1981/11/01	5.00
1981/11/02	4.40
1981/11/03	4.20
1981/11/04	4.00
1981/11/05	3.90
1981/11/06	3.90
1981/11/07	3.80
1981/11/08	5.20
1981/11/09	28.20
1981/11/10	33.10
1981/11/11	22.10
1981/11/12	18.80
1981/11/13	16.55
1981/11/14	13.85
1981/11/15	14.30
1981/11/16	41.50
1981/11/17	155.30
1981/11/18	97.95
1981/11/19	113.40
1981/11/20	107.40
1981/11/21	59.00
1981/11/22	36.60
1981/11/23	27.50
1981/11/24	25.10
1981/11/25	25.70
1981/11/26	26.30
1981/11/27	25.10
1981/11/28	23.30
1981/11/29	23.30
1981/11/30	22.10
1981/12/01	21.50
1981/12/02	21.05
1981/12/03	21.05
1981/12/04	20.60
1981/12/05	20.15
1981/12/06	20.15
1981/12/07	19.25
1981/12/08	17.90
1981/12/09	17.00
1981/12/10	15.65
1981/12/11	15.65
1981/12/12	15.20
1981/12/13	14.75
1981/12/14	20.60
1981/12/15	23.30
1981/12/16	22.10
1981/12/17	17.90
1981/12/18	17.45
1981/12/19	14.75
1981/12/20	14.30
1981/12/21	13.40
1981/12/22	12.95
1981/12/23	12.95
1981/12/24	12.95
1981/12/25	12.50
1981/12/26	12.15
1981/12/27	11.10
1981/12/28	10.05
1981/12/29	8.70
1981/12/30	6.60
1981/12/31	6.00
#===========================================
# Number of observations = 365 / 365
# Average = 14.28