1981/01/01	4.20
1981/01/02	4.00
1981/01/03	4.80
1981/01/04	5.40
1981/01/05	5.20
1981/01/06	4.60
1981/01/07	4.00
1981/01/08	4.00
1981/01/09	4.00
1981/01/10	4.00
1981/01/11	4.00
1981/01/12	3.70
1981/01/13	3.60
1981/01/14	3.50
1981/01/15	3.70
1981/01/16	3.70
1981/01/17	3.70
1981/01/18	3.50
1981/01/19	3.40
1981/01/20	3.30
1981/01/21	3.40
1981/01/22	3.30
1981/01/23	3.30
1981/01/24	3.30
1981/01/25	3.40
1981/01/26	3.40
1981/01/27	3.30
1981/01/28	3.40
1981/01/29	3.20
1981/01/30	3.20
1981/01/31	3.20
1981/02/01	3.20
1981/02/02	2.90
1981/02/03	2.60
1981/02/04	2.60
1981/02/05	2.60
1981/02/06	2.60
1981/02/07	2.60
1981/02/08	2.60
1981/02/09	2.80
1981/02/10	2.80
1981/02/11	3.00
1981/02/12	3.00
1981/02/13	2.90
1981/02/14	2.90
1981/02/15	2.80
1981/02/16	2.80
1981/02/17	2.90
1981/02/18	2.90
1981/02/19	2.90
1981/02/20	2.90
1981/02/21	2.90
1981/02/22	2.80
1981/02/23	2.80
1981/02/24	2.60
1981/02/25	2.60
1981/02/26	2.60
1981/02/27	2.30
1981/02/28	2.00
1981/03/01	2.00
1981/03/02	2.30
1981/03/03	2.60
1981/03/04	2.60
1981/03/05	2.40
1981/03/06	2.00
1981/03/07	2.00
1981/03/08	2.00
1981/03/09	2.00
1981/03/10	2.00
1981/03/11	2.00
1981/03/12	2.00
1981/03/13	2.00
1981/03/14	3.30
1981/03/15	3.20
1981/03/16	3.10
1981/03/17	3.00
1981/03/18	2.80
1981/03/19	2.40
1981/03/20	2.20
1981/03/21	2.20
1981/03/22	2.00
1981/03/23	2.00
1981/03/24	1.80
1981/03/25	1.70
1981/03/26	1.50
1981/03/27	1.50
1981/03/28	1.50
1981/03/29	1.30
1981/03/30	1.30
1981/03/31	1.30
1981/04/01	1.60
1981/04/02	1.90
1981/04/03	1.80
1981/04/04	1.80
1981/04/05	1.80
1981/04/06	1.80
1981/04/07	1.70
1981/04/08	1.60
1981/04/09	1.40
1981/04/10	1.40
1981/04/11	1.40
1981/04/12	1.30
1981/04/13	1.80
1981/04/14	1.70
1981/04/15	1.80
1981/04/16	1.70
1981/04/17	1.60
1981/04/18	1.50
1981/04/19	1.50
1981/04/20	1.40
1981/04/21	1.40
1981/04/22	1.20
1981/04/23	1.20
1981/04/24	1.20
1981/04/25	1.20
1981/04/26	1.30
1981/04/27	1.60
1981/04/28	1.80
1981/04/29	6.10
1981/04/30	4.58
1981/05/01	2.80
1981/05/02	2.66
1981/05/03	2.10
1981/05/04	2.24
1981/05/05	2.66
1981/05/06	2.66
1981/05/07	2.66
1981/05/08	3.22
1981/05/09	3.36
1981/05/10	6.70
1981/05/11	7.53
1981/05/12	6.10
1981/05/13	5.12
1981/05/14	4.22
1981/05/15	3.68
1981/05/16	3.68
1981/05/17	3.50
1981/05/18	3.50
1981/05/19	3.86
1981/05/20	4.04
1981/05/21	4.76
1981/05/22	5.30
1981/05/23	7.10
1981/05/24	12.20
1981/05/25	27.02
1981/05/26	166.50
1981/05/27	217.00
1981/05/28	123.25
1981/05/29	75.64
1981/05/30	59.94
1981/05/31	44.76
1981/06/01	37.35
1981/06/02	30.74
1981/06/03	26.00
1981/06/04	24.12
1981/06/05	23.88
1981/06/06	23.70
1981/06/07	23.46
1981/06/08	14.28
1981/06/09	12.98
1981/06/10	12.72
1981/06/11	11.68
1981/06/12	10.90
1981/06/13	10.12
1981/06/14	9.37
1981/06/15	9.14
1981/06/16	8.91
1981/06/17	7.76
1981/06/18	7.30
1981/06/19	7.10
1981/06/20	6.70
1981/06/21	6.10
1981/06/22	5.90
1981/06/23	6.30
1981/06/24	6.30
1981/06/25	12.46
1981/06/26	13.24
1981/06/27	12.20
1981/06/28	12.20
1981/06/29	12.98
1981/06/30	23.79
1981/07/01	23.97
1981/07/02	23.79
1981/07/03	23.46
1981/07/04	12.46
1981/07/05	10.12
1981/07/06	9.14
1981/07/07	8.68
1981/07/08	8.68
1981/07/09	74.56
1981/07/10	184.00
1981/07/11	109.50
1981/07/12	115.80
1981/07/13	141.70
1981/07/14	142.55
1981/07/15	127.20
1981/07/16	97.95
1981/07/17	71.86
1981/07/18	54.65
1981/07/19	43.92
1981/07/20	46.86
1981/07/21	43.09
1981/07/22	43.50
1981/07/23	58.47
1981/07/24	135.20
1981/07/25	178.00
1981/07/26	189.00
1981/07/27	185.00
1981/07/28	177.00
1981/07/29	202.30
1981/07/30	206.50
1981/07/31	202.30
1981/08/01	204.40
1981/08/02	230.80
1981/08/03	220.15
1981/08/04	166.50
1981/08/05	159.30
1981/08/06	195.00
1981/08/07	251.15
1981/08/08	319.80
1981/08/09	261.50
1981/08/10	215.95
1981/08/11	188.00
1981/08/12	162.00
1981/08/13	315.00
1981/08/14	301.80
1981/08/15	220.15
1981/08/16	170.30
1981/08/17	121.75
1981/08/18	94.70
1981/08/19	80.65
1981/08/20	65.47
1981/08/21	56.53
1981/08/22	64.96
1981/08/23	87.10
1981/08/24	83.50
1981/08/25	67.54
1981/08/26	63.94
1981/08/27	62.41
1981/08/28	55.59
1981/08/29	48.16
1981/08/30	42.68
1981/08/31	49.54
1981/09/01	46.86
1981/09/02	41.45
1981/09/03	40.63
1981/09/04	108.80
1981/09/05	128.80
1981/09/06	92.75
1981/09/07	81.22
1981/09/08	84.10
1981/09/09	128.00
1981/09/10	191.00
1981/09/11	167.45
1981/09/12	159.30
1981/09/13	149.40
1981/09/14	133.60
1981/09/15	123.25
1981/09/16	96.65
1981/09/17	67.00
1981/09/18	46.86
1981/09/19	39.81
1981/09/20	36.94
1981/09/21	33.40
1981/09/22	31.50
1981/09/23	29.98
1981/09/24	30.36
1981/09/25	29.60
1981/09/26	27.36
1981/09/27	35.30
1981/09/28	45.60
1981/09/29	51.38
1981/09/30	39.81
1981/10/01	33.02
1981/10/02	28.84
1981/10/03	27.36
1981/10/04	26.00
1981/10/05	24.98
1981/10/06	26.34
1981/10/07	29.60
1981/10/08	31.88
1981/10/09	32.64
1981/10/10	33.78
1981/10/11	37.76
1981/10/12	38.17
1981/10/13	97.95
1981/10/14	95.35
1981/10/15	69.70
1981/10/16	54.18
1981/10/17	45.60
1981/10/18	47.28
1981/10/19	73.48
1981/10/20	115.10
1981/10/21	131.20
1981/10/22	126.40
1981/10/23	115.80
1981/10/24	87.10
1981/10/25	58.96
1981/10/26	47.70
1981/10/27	43.92
1981/10/28	46.44
1981/10/29	52.30
1981/10/30	43.09
1981/10/31	49.54
1981/11/01	49.08
1981/11/02	36.94
1981/11/03	31.88
1981/11/04	28.84
1981/11/05	26.00
1981/11/06	24.64
1981/11/07	24.15
1981/11/08	24.27
1981/11/09	24.30
1981/11/10	24.27
1981/11/11	25.32
1981/11/12	26.00
1981/11/13	25.66
1981/11/14	27.70
1981/11/15	29.98
1981/11/16	27.02
1981/11/17	32.26
1981/11/18	41.04
1981/11/19	53.71
1981/11/20	92.75
1981/11/21	118.00
1981/11/22	115.10
1981/11/23	76.72
1981/11/24	56.06
1981/11/25	50.92
1981/11/26	46.44
1981/11/27	41.45
1981/11/28	38.58
1981/11/29	36.12
1981/11/30	33.02
1981/12/01	28.46
1981/12/02	32.64
1981/12/03	29.60
1981/12/04	27.70
1981/12/05	26.00
1981/12/06	24.64
1981/12/07	24.12
1981/12/08	23.91
1981/12/09	23.73
1981/12/10	23.61
1981/12/11	23.52
1981/12/12	23.49
1981/12/13	23.43
1981/12/14	14.28
1981/12/15	14.02
1981/12/16	14.02
1981/12/17	14.54
1981/12/18	23.55
1981/12/19	23.55
1981/12/20	23.76
1981/12/21	23.82
1981/12/22	14.28
1981/12/23	12.72
1981/12/24	12.20
1981/12/25	11.94
1981/12/26	11.68
1981/12/27	11.42
1981/12/28	10.90
1981/12/29	10.90
1981/12/30	10.64
1981/12/31	10.12
#===========================================
# Number of observations = 365 / 365
# Average = 41.43