1981/01/01	7.60
1981/01/02	7.90
1981/01/03	7.00
1981/01/04	7.00
1981/01/05	7.00
1981/01/06	7.00
1981/01/07	7.00
1981/01/08	6.70
1981/01/09	6.40
1981/01/10	6.40
1981/01/11	6.40
1981/01/12	6.40
1981/01/13	6.10
1981/01/14	6.10
1981/01/15	6.10
1981/01/16	5.80
1981/01/17	5.80
1981/01/18	5.80
1981/01/19	5.80
1981/01/20	6.40
1981/01/21	7.00
1981/01/22	6.70
1981/01/23	6.10
1981/01/24	6.10
1981/01/25	5.80
1981/01/26	5.50
1981/01/27	5.50
1981/01/28	5.50
1981/01/29	5.20
1981/01/30	5.20
1981/01/31	5.20
1981/02/01	5.20
1981/02/02	5.20
1981/02/03	5.20
1981/02/04	5.20
1981/02/05	5.20
1981/02/06	4.90
1981/02/07	4.90
1981/02/08	4.60
1981/02/09	4.30
1981/02/10	3.74
1981/02/11	3.48
1981/02/12	3.48
1981/02/13	3.48
1981/02/14	3.48
1981/02/15	3.48
1981/02/16	3.22
1981/02/17	2.96
1981/02/18	3.22
1981/02/19	3.74
1981/02/20	3.48
1981/02/21	3.48
1981/02/22	3.48
1981/02/23	3.48
1981/02/24	3.48
1981/02/25	3.48
1981/02/26	3.22
1981/02/27	3.22
1981/02/28	3.22
1981/03/01	3.22
1981/03/02	2.96
1981/03/03	2.96
1981/03/04	2.96
1981/03/05	2.96
1981/03/06	3.22
1981/03/07	3.22
1981/03/08	3.22
1981/03/09	3.74
1981/03/10	3.22
1981/03/11	2.70
1981/03/12	2.70
1981/03/13	2.70
1981/03/14	2.70
1981/03/15	2.44
1981/03/16	2.44
1981/03/17	2.44
1981/03/18	2.44
1981/03/19	2.18
1981/03/20	1.92
1981/03/21	2.18
1981/03/22	1.92
1981/03/23	2.18
1981/03/24	2.18
1981/03/25	2.18
1981/03/26	1.92
1981/03/27	1.92
1981/03/28	1.66
1981/03/29	1.66
1981/03/30	1.66
1981/03/31	1.66
1981/04/01	3.25
1981/04/02	3.00
1981/04/03	2.75
1981/04/04	2.50
1981/04/05	2.75
1981/04/06	2.50
1981/04/07	2.50
1981/04/08	2.25
1981/04/09	2.25
1981/04/10	2.00
1981/04/11	1.75
1981/04/12	1.75
1981/04/13	1.25
1981/04/14	3.50
1981/04/15	4.00
1981/04/16	4.25
1981/04/17	5.90
1981/04/18	8.00
1981/04/19	6.20
1981/04/20	5.90
1981/04/21	5.90
1981/04/22	4.50
1981/04/23	4.00
1981/04/24	4.00
1981/04/25	3.75
1981/04/26	3.50
1981/04/27	3.50
1981/04/28	3.50
1981/04/29	3.50
1981/04/30	3.50
1981/05/01	3.25
1981/05/02	3.00
1981/05/03	3.25
1981/05/04	12.80
1981/05/05	60.70
1981/05/06	30.53
1981/05/07	15.20
1981/05/08	11.60
1981/05/09	9.20
1981/05/10	10.40
1981/05/11	10.80
1981/05/12	7.70
1981/05/13	7.10
1981/05/14	6.50
1981/05/15	8.40
1981/05/16	13.20
1981/05/17	50.90
1981/05/18	5.00
1981/05/19	0
1981/05/20	17.60
1981/05/21	14.00
1981/05/22	18.80
1981/05/23	143.40
1981/05/24	247.60
1981/05/25	188.60
1981/05/26	90.10
1981/05/27	45.47
1981/05/28	33.73
1981/05/29	43.33
1981/05/30	69.80
1981/05/31	69.10
1981/06/01	27.00
1981/06/02	26.00
1981/06/03	18.40
1981/06/04	17.60
1981/06/05	15.60
1981/06/06	14.40
1981/06/07	14.80
1981/06/08	14.40
1981/06/09	12.40
1981/06/10	12.00
1981/06/11	10.80
1981/06/12	10.00
1981/06/13	9.60
1981/06/14	8.80
1981/06/15	9.20
1981/06/16	12.80
1981/06/17	9.60
1981/06/18	8.80
1981/06/19	8.00
1981/06/20	8.00
1981/06/21	7.70
1981/06/22	7.40
1981/06/23	7.70
1981/06/24	8.00
1981/06/25	8.00
1981/06/26	21.00
1981/06/27	16.00
1981/06/28	13.20
1981/06/29	11.20
1981/06/30	10.00
1981/07/01	9.60
1981/07/02	8.80
1981/07/03	8.40
1981/07/04	8.00
1981/07/05	8.80
1981/07/06	440.00
1981/07/07	888.10
1981/07/08	323.40
1981/07/09	165.00
1981/07/10	334.70
1981/07/11	458.00
1981/07/12	227.70
1981/07/13	132.60
1981/07/14	94.30
1981/07/15	70.50
1981/07/16	79.60
1981/07/17	78.90
1981/07/18	156.00
1981/07/19	372.40
1981/07/20	370.60
1981/07/21	400.20
1981/07/22	297.80
1981/07/23	173.00
1981/07/24	243.40
1981/07/25	496.30
1981/07/26	256.00
1981/07/27	170.60
1981/07/28	136.20
1981/07/29	161.00
1981/07/30	213.40
1981/07/31	251.80
1981/08/01	182.60
1981/08/02	137.10
1981/08/03	132.60
1981/08/04	203.00
1981/08/05	271.50
1981/08/06	498.35
1981/08/07	268.60
1981/08/08	195.80
1981/08/09	152.00
1981/08/10	165.00
1981/08/11	442.00
1981/08/12	235.50
1981/08/13	158.00
1981/08/14	120.00
1981/08/15	99.80
1981/08/16	85.90
1981/08/17	82.40
1981/08/18	112.80
1981/08/19	297.80
1981/08/20	329.80
1981/08/21	141.60
1981/08/22	106.20
1981/08/23	162.00
1981/08/24	150.00
1981/08/25	106.20
1981/08/26	88.00
1981/08/27	75.40
1981/08/28	76.80
1981/08/29	62.80
1981/08/30	54.40
1981/08/31	51.60
1981/09/01	247.60
1981/09/02	234.20
1981/09/03	175.40
1981/09/04	131.70
1981/09/05	169.40
1981/09/06	142.50
1981/09/07	198.20
1981/09/08	166.00
1981/09/09	120.00
1981/09/10	94.30
1981/09/11	91.50
1981/09/12	107.80
1981/09/13	85.20
1981/09/14	68.40
1981/09/15	59.30
1981/09/16	74.70
1981/09/17	69.80
1981/09/18	66.30
1981/09/19	57.20
1981/09/20	56.50
1981/09/21	68.40
1981/09/22	71.90
1981/09/23	60.00
1981/09/24	51.60
1981/09/25	54.40
1981/09/26	49.50
1981/09/27	41.73
1981/09/28	41.73
1981/09/29	42.27
1981/09/30	36.93
1981/10/01	30.53
1981/10/02	40.13
1981/10/03	74.70
1981/10/04	74.00
1981/10/05	53.70
1981/10/06	46.70
1981/10/07	40.67
1981/10/08	39.07
1981/10/09	39.60
1981/10/10	189.80
1981/10/11	251.80
1981/10/12	124.50
1981/10/13	87.30
1981/10/14	98.20
1981/10/15	88.70
1981/10/16	70.50
1981/10/17	95.00
1981/10/18	203.00
1981/10/19	186.20
1981/10/20	128.10
1981/10/21	90.10
1981/10/22	92.20
1981/10/23	74.70
1981/10/24	86.60
1981/10/25	87.30
1981/10/26	105.40
1981/10/27	81.70
1981/10/28	60.70
1981/10/29	51.60
1981/10/30	46.00
1981/10/31	43.87
1981/11/01	39.07
1981/11/02	37.47
1981/11/03	36.40
1981/11/04	34.27
1981/11/05	32.67
1981/11/06	32.13
1981/11/07	31.07
1981/11/08	31.07
1981/11/09	30.53
1981/11/10	30.53
1981/11/11	29.50
1981/11/12	28.00
1981/11/13	27.50
1981/11/14	33.20
1981/11/15	33.20
1981/11/16	34.80
1981/11/17	321.80
1981/11/18	212.10
1981/11/19	104.60
1981/11/20	71.20
1981/11/21	55.80
1981/11/22	44.93
1981/11/23	40.13
1981/11/24	36.93
1981/11/25	34.27
1981/11/26	31.60
1981/11/27	29.50
1981/11/28	29.00
1981/11/29	27.50
1981/11/30	26.00
1981/12/01	25.50
1981/12/02	24.50
1981/12/03	24.00
1981/12/04	23.00
1981/12/05	22.00
1981/12/06	21.50
1981/12/07	21.50
1981/12/08	21.00
1981/12/09	20.00
1981/12/10	19.60
1981/12/11	19.60
1981/12/12	19.60
1981/12/13	19.20
1981/12/14	19.20
1981/12/15	18.80
1981/12/16	18.80
1981/12/17	18.40
1981/12/18	18.00
1981/12/19	17.60
1981/12/20	16.80
1981/12/21	16.80
1981/12/22	16.40
1981/12/23	16.00
1981/12/24	16.00
1981/12/25	15.60
1981/12/26	15.20
1981/12/27	15.20
1981/12/28	14.80
1981/12/29	14.80
1981/12/30	14.40
1981/12/31	14.00
#===========================================
# Number of observations = 365 / 365
# Average = 61.04