1981/01/01	13.04
1981/01/02	13.04
1981/01/03	12.96
1981/01/04	12.72
1981/01/05	12.16
1981/01/06	11.45
1981/01/07	10.94
1981/01/08	10.50
1981/01/09	10.29
1981/01/10	9.85
1981/01/11	9.19
1981/01/12	8.68
1981/01/13	8.27
1981/01/14	7.86
1981/01/15	7.52
1981/01/16	7.31
1981/01/17	7.17
1981/01/18	7.10
1981/01/19	7.04
1981/01/20	6.97
1981/01/21	6.90
1981/01/22	6.83
1981/01/23	6.69
1981/01/24	6.35
1981/01/25	6.08
1981/01/26	5.75
1981/01/27	5.49
1981/01/28	5.30
1981/01/29	5.05
1981/01/30	4.80
1981/01/31	5.24
1981/02/01	6.97
1981/02/02	8.34
1981/02/03	9.56
1981/02/04	12.32
1981/02/05	13.36
1981/02/06	13.20
1981/02/07	13.20
1981/02/08	13.28
1981/02/09	13.45
1981/02/10	13.36
1981/02/11	13.28
1981/02/12	13.04
1981/02/13	12.16
1981/02/14	12.00
1981/02/15	12.96
1981/02/16	13.45
1981/02/17	13.45
1981/02/18	13.45
1981/02/19	13.53
1981/02/20	13.53
1981/02/21	13.53
1981/02/22	13.36
1981/02/23	12.80
1981/02/24	11.84
1981/02/25	11.92
1981/02/26	11.53
1981/02/27	11.92
1981/02/28	12.00
1981/03/01	11.92
1981/03/02	12.32
1981/03/03	12.00
1981/03/04	11.76
1981/03/05	11.76
1981/03/06	11.68
1981/03/07	11.68
1981/03/08	11.68
1981/03/09	11.60
1981/03/10	11.60
1981/03/11	11.53
1981/03/12	11.31
1981/03/13	11.16
1981/03/14	10.87
1981/03/15	10.21
1981/03/16	9.63
1981/03/17	9.41
1981/03/18	9.19
1981/03/19	8.83
1981/03/20	8.47
1981/03/21	8.20
1981/03/22	8.00
1981/03/23	7.79
1981/03/24	7.52
1981/03/25	7.24
1981/03/26	7.04
1981/03/27	6.90
1981/03/28	6.76
1981/03/29	6.56
1981/03/30	6.35
1981/03/31	6.15
1981/04/01	6.14
1981/04/02	6.08
1981/04/03	5.94
1981/04/04	5.94
1981/04/05	5.88
1981/04/06	5.75
1981/04/07	5.62
1981/04/08	5.43
1981/04/09	5.18
1981/04/10	4.93
1981/04/11	4.80
1981/04/12	4.68
1981/04/13	4.74
1981/04/14	4.62
1981/04/15	4.44
1981/04/16	4.32
1981/04/17	4.38
1981/04/18	4.38
1981/04/19	4.62
1981/04/20	11.84
1981/04/21	13.94
1981/04/22	13.86
1981/04/23	13.69
1981/04/24	13.45
1981/04/25	13.53
1981/04/26	13.77
1981/04/27	13.69
1981/04/28	13.61
1981/04/29	13.61
1981/04/30	13.69
1981/05/01	13.69
1981/05/02	13.69
1981/05/03	13.61
1981/05/04	13.69
1981/05/05	13.77
1981/05/06	14.02
1981/05/07	14.09
1981/05/08	14.09
1981/05/09	13.94
1981/05/10	14.02
1981/05/11	14.02
1981/05/12	13.86
1981/05/13	13.94
1981/05/14	13.86
1981/05/15	13.77
1981/05/16	13.77
1981/05/17	13.94
1981/05/18	14.09
1981/05/19	15.10
1981/05/20	15.90
1981/05/21	17.20
1981/05/22	16.70
1981/05/23	16.30
1981/05/24	16.10
1981/05/25	15.20
1981/05/26	14.90
1981/05/27	14.83
1981/05/28	14.90
1981/05/29	14.68
1981/05/30	14.46
1981/05/31	14.24
1981/06/01	13.94
1981/06/02	13.77
1981/06/03	14.02
1981/06/04	13.77
1981/06/05	13.53
1981/06/06	13.61
1981/06/07	14.17
1981/06/08	14.02
1981/06/09	13.86
1981/06/10	13.77
1981/06/11	13.69
1981/06/12	13.69
1981/06/13	13.77
1981/06/14	13.61
1981/06/15	13.61
1981/06/16	13.45
1981/06/17	13.36
1981/06/18	13.36
1981/06/19	13.53
1981/06/20	13.53
1981/06/21	13.53
1981/06/22	13.61
1981/06/23	14.31
1981/06/24	14.61
1981/06/25	14.61
1981/06/26	16.60
1981/06/27	18.50
1981/06/28	19.20
1981/06/29	17.40
1981/06/30	15.90
1981/07/01	14.39
1981/07/02	14.17
1981/07/03	13.69
1981/07/04	13.53
1981/07/05	13.45
1981/07/06	13.45
1981/07/07	16.00
1981/07/08	36.48
1981/07/09	47.96
1981/07/10	45.80
1981/07/11	33.92
1981/07/12	26.67
1981/07/13	22.14
1981/07/14	19.81
1981/07/15	18.10
1981/07/16	16.60
1981/07/17	16.40
1981/07/18	16.40
1981/07/19	16.40
1981/07/20	16.40
1981/07/21	28.49
1981/07/22	49.78
1981/07/23	60.98
1981/07/24	70.40
1981/07/25	83.50
1981/07/26	90.98
1981/07/27	86.90
1981/07/28	74.90
1981/07/29	60.98
1981/07/30	46.86
1981/07/31	40.78
1981/08/01	44.01
1981/08/02	48.63
1981/08/03	46.00
1981/08/04	52.08
1981/08/05	69.20
1981/08/06	87.24
1981/08/07	100.75
1981/08/08	112.65
1981/08/09	132.10
1981/08/10	139.58
1981/08/11	141.50
1981/08/12	142.94
1981/08/13	148.22
1981/08/14	153.06
1981/08/15	153.06
1981/08/16	148.70
1981/08/17	129.85
1981/08/18	85.54
1981/08/19	47.74
1981/08/20	31.35
1981/08/21	26.41
1981/08/22	23.94
1981/08/23	22.38
1981/08/24	24.66
1981/08/25	24.30
1981/08/26	22.02
1981/08/27	20.03
1981/08/28	18.80
1981/08/29	19.00
1981/08/30	20.03
1981/08/31	20.03
1981/09/01	20.36
1981/09/02	22.74
1981/09/03	43.25
1981/09/04	64.34
1981/09/05	73.10
1981/09/06	74.60
1981/09/07	81.46
1981/09/08	83.50
1981/09/09	73.40
1981/09/10	53.75
1981/09/11	38.33
1981/09/12	29.40
1981/09/13	24.78
1981/09/14	23.46
1981/09/15	24.42
1981/09/16	22.38
1981/09/17	20.91
1981/09/18	20.25
1981/09/19	19.92
1981/09/20	19.20
1981/09/21	18.50
1981/09/22	18.10
1981/09/23	17.50
1981/09/24	16.70
1981/09/25	16.90
1981/09/26	16.90
1981/09/27	17.40
1981/09/28	17.40
1981/09/29	17.40
1981/09/30	17.20
1981/10/01	16.90
1981/10/02	17.20
1981/10/03	16.50
1981/10/04	16.60
1981/10/05	16.20
1981/10/06	16.00
1981/10/07	17.10
1981/10/08	17.50
1981/10/09	18.30
1981/10/10	21.13
1981/10/11	21.02
1981/10/12	20.25
1981/10/13	19.20
1981/10/14	18.50
1981/10/15	17.90
1981/10/16	17.50
1981/10/17	18.90
1981/10/18	27.58
1981/10/19	42.30
1981/10/20	44.80
1981/10/21	36.00
1981/10/22	27.71
1981/10/23	22.98
1981/10/24	21.02
1981/10/25	19.92
1981/10/26	18.80
1981/10/27	18.20
1981/10/28	17.30
1981/10/29	16.30
1981/10/30	16.20
1981/10/31	15.40
1981/11/01	15.40
1981/11/02	15.80
1981/11/03	16.30
1981/11/04	17.30
1981/11/05	18.90
1981/11/06	21.35
1981/11/07	21.57
1981/11/08	20.80
1981/11/09	19.60
1981/11/10	19.40
1981/11/11	18.90
1981/11/12	17.70
1981/11/13	17.80
1981/11/14	18.00
1981/11/15	17.80
1981/11/16	17.60
1981/11/17	17.60
1981/11/18	17.70
1981/11/19	17.70
1981/11/20	17.40
1981/11/21	17.00
1981/11/22	16.80
1981/11/23	16.70
1981/11/24	16.50
1981/11/25	16.60
1981/11/26	16.50
1981/11/27	16.50
1981/11/28	16.80
1981/11/29	16.90
1981/11/30	16.50
1981/12/01	16.30
1981/12/02	16.10
1981/12/03	15.90
1981/12/04	15.70
1981/12/05	15.60
1981/12/06	15.60
1981/12/07	15.50
1981/12/08	15.40
1981/12/09	15.30
1981/12/10	15.30
1981/12/11	15.20
1981/12/12	15.30
1981/12/13	15.40
1981/12/14	15.30
1981/12/15	15.10
1981/12/16	15.00
1981/12/17	14.90
1981/12/18	14.83
1981/12/19	14.75
1981/12/20	14.68
1981/12/21	14.68
1981/12/22	14.68
1981/12/23	14.61
1981/12/24	14.61
1981/12/25	14.61
1981/12/26	14.53
1981/12/27	14.39
1981/12/28	14.31
1981/12/29	14.39
1981/12/30	14.39
1981/12/31	14.39
#===========================================
# Number of observations = 365 / 365
# Average = 22.11