1981/01/01	4.40
1981/01/02	4.30
1981/01/03	4.20
1981/01/04	4.10
1981/01/05	4.10
1981/01/06	4.00
1981/01/07	3.80
1981/01/08	3.80
1981/01/09	3.80
1981/01/10	3.80
1981/01/11	3.70
1981/01/12	1.93
1981/01/13	3.50
1981/01/14	3.40
1981/01/15	3.30
1981/01/16	3.20
1981/01/17	3.20
1981/01/18	3.10
1981/01/19	3.00
1981/01/20	3.00
1981/01/21	2.90
1981/01/22	2.90
1981/01/23	2.80
1981/01/24	2.80
1981/01/25	2.80
1981/01/26	2.70
1981/01/27	2.70
1981/01/28	2.60
1981/01/29	2.60
1981/01/30	2.60
1981/01/31	2.50
1981/02/01	2.40
1981/02/02	2.50
1981/02/03	2.40
1981/02/04	2.40
1981/02/05	2.30
1981/02/06	2.30
1981/02/07	2.20
1981/02/08	2.10
1981/02/09	2.10
1981/02/10	2.10
1981/02/11	2.10
1981/02/12	2.10
1981/02/13	2.00
1981/02/14	1.93
1981/02/15	1.77
1981/02/16	1.85
1981/02/17	1.85
1981/02/18	1.77
1981/02/19	1.70
1981/02/20	1.70
1981/02/21	1.70
1981/02/22	1.62
1981/02/23	1.70
1981/02/24	1.70
1981/02/25	1.62
1981/02/26	1.55
1981/02/27	1.55
1981/02/28	2.10
1981/03/01	1.77
1981/03/02	1.62
1981/03/03	1.55
1981/03/04	1.48
1981/03/05	1.48
1981/03/06	1.48
1981/03/07	1.48
1981/03/08	1.48
1981/03/09	1.48
1981/03/10	1.93
1981/03/11	2.60
1981/03/12	2.60
1981/03/13	2.20
1981/03/14	1.93
1981/03/15	1.62
1981/03/16	1.62
1981/03/17	1.55
1981/03/18	1.40
1981/03/19	1.40
1981/03/20	1.32
1981/03/21	1.32
1981/03/22	1.32
1981/03/23	1.32
1981/03/24	1.25
1981/03/25	1.25
1981/03/26	1.17
1981/03/27	1.17
1981/03/28	1.02
1981/03/29	0.95
1981/03/30	0.80
1981/03/31	0.87
1981/04/01	1.05
1981/04/02	1.26
1981/04/03	1.33
1981/04/04	1.40
1981/04/05	1.72
1981/04/06	1.61
1981/04/07	1.72
1981/04/08	1.61
1981/04/09	1.50
1981/04/10	1.33
1981/04/11	1.12
1981/04/12	0.98
1981/04/13	0.98
1981/04/14	0.98
1981/04/15	0.91
1981/04/16	0.91
1981/04/17	1.05
1981/04/18	1.05
1981/04/19	1.05
1981/04/20	1.05
1981/04/21	7.52
1981/04/22	16.90
1981/04/23	13.60
1981/04/24	7.66
1981/04/25	5.42
1981/04/26	5.30
1981/04/27	4.46
1981/04/28	3.86
1981/04/29	8.50
1981/04/30	6.14
1981/05/01	5.78
1981/05/02	6.02
1981/05/03	6.50
1981/05/04	8.22
1981/05/05	15.19
1981/05/06	14.47
1981/05/07	9.25
1981/05/08	7.38
1981/05/09	7.94
1981/05/10	9.55
1981/05/11	7.24
1981/05/12	7.24
1981/05/13	6.50
1981/05/14	6.26
1981/05/15	13.43
1981/05/16	9.85
1981/05/17	6.86
1981/05/18	5.66
1981/05/19	16.33
1981/05/20	27.63
1981/05/21	17.28
1981/05/22	13.95
1981/05/23	23.64
1981/05/24	14.83
1981/05/25	12.55
1981/05/26	11.68
1981/05/27	11.85
1981/05/28	11.68
1981/05/29	13.95
1981/05/30	16.14
1981/05/31	11.50
1981/06/01	9.70
1981/06/02	8.50
1981/06/03	7.66
1981/06/04	14.47
1981/06/05	15.19
1981/06/06	17.85
1981/06/07	15.95
1981/06/08	22.38
1981/06/09	19.18
1981/06/10	15.38
1981/06/11	13.25
1981/06/12	12.20
1981/06/13	12.02
1981/06/14	13.08
1981/06/15	16.14
1981/06/16	16.71
1981/06/17	19.56
1981/06/18	14.83
1981/06/19	13.25
1981/06/20	14.65
1981/06/21	26.95
1981/06/22	29.91
1981/06/23	31.95
1981/06/24	47.76
1981/06/25	48.32
1981/06/26	73.25
1981/06/27	56.00
1981/06/28	46.12
1981/06/29	41.80
1981/06/30	34.26
1981/07/01	29.91
1981/07/02	23.64
1981/07/03	19.37
1981/07/04	17.28
1981/07/05	15.95
1981/07/06	21.96
1981/07/07	96.70
1981/07/08	84.12
1981/07/09	55.70
1981/07/10	48.32
1981/07/11	62.93
1981/07/12	60.50
1981/07/13	50.90
1981/07/14	40.18
1981/07/15	33.32
1981/07/16	30.36
1981/07/17	32.86
1981/07/18	33.77
1981/07/19	33.55
1981/07/20	49.16
1981/07/21	52.10
1981/07/22	62.31
1981/07/23	64.48
1981/07/24	50.00
1981/07/25	72.20
1981/07/26	121.01
1981/07/27	103.10
1981/07/28	106.44
1981/07/29	87.50
1981/07/30	69.58
1981/07/31	80.75
1981/08/01	102.70
1981/08/02	105.97
1981/08/03	154.80
1981/08/04	150.03
1981/08/05	129.49
1981/08/06	199.20
1981/08/07	167.68
1981/08/08	169.92
1981/08/09	148.46
1981/08/10	144.30
1981/08/11	335.78
1981/08/12	235.29
1981/08/13	166.00
1981/08/14	127.59
1981/08/15	117.25
1981/08/16	92.00
1981/08/17	74.30
1981/08/18	65.42
1981/08/19	59.30
1981/08/20	66.06
1981/08/21	66.06
1981/08/22	59.90
1981/08/23	53.60
1981/08/24	63.86
1981/08/25	55.10
1981/08/26	46.12
1981/08/27	40.72
1981/08/28	38.34
1981/08/29	36.30
1981/08/30	36.55
1981/08/31	35.53
1981/09/01	45.31
1981/09/02	65.74
1981/09/03	61.10
1981/09/04	56.00
1981/09/05	59.90
1981/09/06	84.87
1981/09/07	80.75
1981/09/08	63.86
1981/09/09	58.40
1981/09/10	53.30
1981/09/11	48.60
1981/09/12	45.31
1981/09/13	44.77
1981/09/14	56.30
1981/09/15	51.20
1981/09/16	43.42
1981/09/17	39.37
1981/09/18	34.77
1981/09/19	32.18
1981/09/20	30.59
1981/09/21	28.77
1981/09/22	27.63
1981/09/23	27.86
1981/09/24	33.55
1981/09/25	43.15
1981/09/26	38.59
1981/09/27	34.26
1981/09/28	32.18
1981/09/29	31.27
1981/09/30	28.77
1981/10/01	28.31
1981/10/02	27.86
1981/10/03	25.81
1981/10/04	25.13
1981/10/05	25.35
1981/10/06	26.26
1981/10/07	31.73
1981/10/08	50.30
1981/10/09	42.61
1981/10/10	51.80
1981/10/11	53.00
1981/10/12	39.91
1981/10/13	32.41
1981/10/14	28.77
1981/10/15	26.26
1981/10/16	25.35
1981/10/17	31.04
1981/10/18	36.81
1981/10/19	32.18
1981/10/20	29.45
1981/10/21	27.63
1981/10/22	27.17
1981/10/23	26.95
1981/10/24	25.13
1981/10/25	21.75
1981/10/26	19.94
1981/10/27	18.61
1981/10/28	17.66
1981/10/29	17.09
1981/10/30	16.52
1981/10/31	15.95
1981/11/01	13.77
1981/11/02	13.08
1981/11/03	15.57
1981/11/04	17.66
1981/11/05	24.69
1981/11/06	26.26
1981/11/07	20.70
1981/11/08	16.90
1981/11/09	14.83
1981/11/10	13.60
1981/11/11	12.73
1981/11/12	12.20
1981/11/13	11.68
1981/11/14	11.85
1981/11/15	10.90
1981/11/16	11.35
1981/11/17	11.68
1981/11/18	12.37
1981/11/19	11.20
1981/11/20	10.60
1981/11/21	9.85
1981/11/22	9.40
1981/11/23	9.10
1981/11/24	8.80
1981/11/25	8.65
1981/11/26	8.50
1981/11/27	10.30
1981/11/28	12.20
1981/11/29	13.25
1981/11/30	10.30
1981/12/01	8.80
1981/12/02	7.94
1981/12/03	7.52
1981/12/04	7.24
1981/12/05	6.86
1981/12/06	6.62
1981/12/07	6.74
1981/12/08	6.50
1981/12/09	6.26
1981/12/10	6.02
1981/12/11	5.90
1981/12/12	6.14
1981/12/13	6.26
1981/12/14	5.90
1981/12/15	5.66
1981/12/16	5.54
1981/12/17	5.18
1981/12/18	5.06
1981/12/19	4.94
1981/12/20	4.70
1981/12/21	4.70
1981/12/22	4.70
1981/12/23	4.46
1981/12/24	4.34
1981/12/25	4.34
1981/12/26	4.22
1981/12/27	4.10
1981/12/28	4.10
1981/12/29	3.98
1981/12/30	3.86
1981/12/31	3.86
#===========================================
# Number of observations = 365 / 365
# Average = 25.47