1981/01/01	5.20
1981/01/02	4.90
1981/01/03	4.90
1981/01/04	4.30
1981/01/05	4.00
1981/01/06	4.00
1981/01/07	3.40
1981/01/08	3.40
1981/01/09	3.70
1981/01/10	3.40
1981/01/11	3.40
1981/01/12	3.10
1981/01/13	3.10
1981/01/14	3.10
1981/01/15	3.10
1981/01/16	3.10
1981/01/17	3.10
1981/01/18	2.80
1981/01/19	2.80
1981/01/20	2.80
1981/01/21	2.80
1981/01/22	2.80
1981/01/23	2.20
1981/01/24	2.20
1981/01/25	1.90
1981/01/26	1.90
1981/01/27	1.90
1981/01/28	1.90
1981/01/29	1.60
1981/01/30	1.30
1981/01/31	1.30
1981/02/01	1.30
1981/02/02	1.00
1981/02/03	1.00
1981/02/04	1.00
1981/02/05	1.00
1981/02/06	0.90
1981/02/07	0.90
1981/02/08	0.90
1981/02/09	0.90
1981/02/10	1.60
1981/02/11	1.00
1981/02/12	0.90
1981/02/13	0.90
1981/02/14	0.90
1981/02/15	0.90
1981/02/16	0.90
1981/02/17	0.90
1981/02/18	0.80
1981/02/19	0.80
1981/02/20	0.80
1981/02/21	0.80
1981/02/22	0.80
1981/02/23	0.80
1981/02/24	0.70
1981/02/25	0.70
1981/02/26	0.70
1981/02/27	0.70
1981/02/28	0.70
1981/03/01	0.70
1981/03/02	0.70
1981/03/03	0.70
1981/03/04	0.70
1981/03/05	0.70
1981/03/06	0.70
1981/03/07	0.70
1981/03/08	0.70
1981/03/09	0.70
1981/03/10	0.70
1981/03/11	0.60
1981/03/12	0.60
1981/03/13	0.60
1981/03/14	0.60
1981/03/15	0.60
1981/03/16	0.60
1981/03/17	0.60
1981/03/18	0.60
1981/03/19	0.60
1981/03/20	0.60
1981/03/21	0.60
1981/03/22	0.60
1981/03/23	0.60
1981/03/24	0.60
1981/03/25	0.60
1981/03/26	0.60
1981/03/27	0.60
1981/03/28	0.60
1981/03/29	0.60
1981/03/30	0.60
1981/03/31	0.60
1981/04/01	4.40
1981/04/02	4.60
1981/04/03	4.80
1981/04/04	5.00
1981/04/05	4.80
1981/04/06	4.80
1981/04/07	4.80
1981/04/08	4.40
1981/04/09	4.20
1981/04/10	4.20
1981/04/11	4.00
1981/04/12	4.00
1981/04/13	4.20
1981/04/14	4.20
1981/04/15	4.20
1981/04/16	4.20
1981/04/17	4.20
1981/04/18	4.20
1981/04/19	4.20
1981/04/20	4.20
1981/04/21	4.40
1981/04/22	4.80
1981/04/23	4.40
1981/04/24	4.40
1981/04/25	4.40
1981/04/26	4.60
1981/04/27	4.60
1981/04/28	4.60
1981/04/29	4.80
1981/04/30	5.00
1981/05/01	4.60
1981/05/02	4.40
1981/05/03	4.20
1981/05/04	4.20
1981/05/05	7.00
1981/05/06	33.20
1981/05/07	38.60
1981/05/08	18.60
1981/05/09	13.40
1981/05/10	11.40
1981/05/11	14.60
1981/05/12	26.00
1981/05/13	13.40
1981/05/14	7.20
1981/05/15	6.20
1981/05/16	5.80
1981/05/17	6.00
1981/05/18	33.20
1981/05/19	50.80
1981/05/20	36.80
1981/05/21	27.50
1981/05/22	36.80
1981/05/23	159.40
1981/05/24	280.00
1981/05/25	378.00
1981/05/26	183.40
1981/05/27	103.00
1981/05/28	61.40
1981/05/29	75.80
1981/05/30	82.20
1981/05/31	80.60
1981/06/01	69.40
1981/06/02	46.60
1981/06/03	31.40
1981/06/04	26.00
1981/06/05	20.50
1981/06/06	18.20
1981/06/07	15.00
1981/06/08	11.80
1981/06/09	11.40
1981/06/10	10.10
1981/06/11	9.20
1981/06/12	9.20
1981/06/13	10.70
1981/06/14	9.20
1981/06/15	8.00
1981/06/16	8.00
1981/06/17	8.00
1981/06/18	8.00
1981/06/19	8.00
1981/06/20	8.00
1981/06/21	8.00
1981/06/22	8.00
1981/06/23	8.00
1981/06/24	8.90
1981/06/25	11.00
1981/06/26	11.00
1981/06/27	10.10
1981/06/28	11.00
1981/06/29	11.00
1981/06/30	11.00
1981/07/01	9.50
1981/07/02	7.80
1981/07/03	7.00
1981/07/04	7.00
1981/07/05	6.80
1981/07/06	93.00
1981/07/07	1088.60
1981/07/08	1219.80
1981/07/09	365.20
1981/07/10	299.20
1981/07/11	568.30
1981/07/12	429.00
1981/07/13	220.80
1981/07/14	136.60
1981/07/15	97.00
1981/07/16	78.20
1981/07/17	108.00
1981/07/18	107.00
1981/07/19	357.20
1981/07/20	434.40
1981/07/21	408.60
1981/07/22	600.60
1981/07/23	349.20
1981/07/24	206.50
1981/07/25	452.40
1981/07/26	483.00
1981/07/27	277.00
1981/07/28	259.20
1981/07/29	234.40
1981/07/30	314.00
1981/07/31	613.90
1981/08/01	461.40
1981/08/02	251.80
1981/08/03	200.00
1981/08/04	179.80
1981/08/05	374.80
1981/08/06	593.00
1981/08/07	587.30
1981/08/08	349.20
1981/08/09	251.80
1981/08/10	207.80
1981/08/11	583.50
1981/08/12	692.00
1981/08/13	344.40
1981/08/14	222.10
1981/08/15	169.00
1981/08/16	125.00
1981/08/17	109.00
1981/08/18	99.00
1981/08/19	308.10
1981/08/20	352.40
1981/08/21	272.60
1981/08/22	163.00
1981/08/23	142.60
1981/08/24	143.80
1981/08/25	179.80
1981/08/26	128.20
1981/08/27	102.00
1981/08/28	86.20
1981/08/29	80.60
1981/08/30	66.20
1981/08/31	61.40
1981/09/01	60.60
1981/09/02	629.10
1981/09/03	268.10
1981/09/04	194.80
1981/09/05	185.80
1981/09/06	198.70
1981/09/07	203.90
1981/09/08	256.30
1981/09/09	182.20
1981/09/10	134.20
1981/09/11	109.00
1981/09/12	112.00
1981/09/13	110.00
1981/09/14	93.00
1981/09/15	68.60
1981/09/16	57.40
1981/09/17	74.20
1981/09/18	74.20
1981/09/19	68.60
1981/09/20	63.00
1981/09/21	55.00
1981/09/22	54.30
1981/09/23	68.60
1981/09/24	59.80
1981/09/25	63.00
1981/09/26	59.00
1981/09/27	48.70
1981/09/28	42.40
1981/09/29	38.60
1981/09/30	37.40
1981/10/01	36.80
1981/10/02	38.00
1981/10/03	39.80
1981/10/04	67.80
1981/10/05	67.00
1981/10/06	61.40
1981/10/07	55.00
1981/10/08	52.20
1981/10/09	45.90
1981/10/10	48.00
1981/10/11	308.10
1981/10/12	213.00
1981/10/13	121.00
1981/10/14	92.00
1981/10/15	97.00
1981/10/16	89.00
1981/10/17	92.00
1981/10/18	135.40
1981/10/19	209.10
1981/10/20	166.60
1981/10/21	121.00
1981/10/22	99.00
1981/10/23	95.00
1981/10/24	83.00
1981/10/25	92.00
1981/10/26	85.40
1981/10/27	101.00
1981/10/28	77.40
1981/10/29	63.80
1981/10/30	55.00
1981/10/31	48.70
1981/11/01	45.20
1981/11/02	41.00
1981/11/03	37.40
1981/11/04	34.40
1981/11/05	34.40
1981/11/06	32.60
1981/11/07	30.80
1981/11/08	29.60
1981/11/09	27.50
1981/11/10	27.00
1981/11/11	25.50
1981/11/12	27.50
1981/11/13	27.50
1981/11/14	29.00
1981/11/15	32.00
1981/11/16	36.20
1981/11/17	37.40
1981/11/18	177.40
1981/11/19	219.50
1981/11/20	130.60
1981/11/21	89.00
1981/11/22	67.80
1981/11/23	52.90
1981/11/24	46.60
1981/11/25	42.40
1981/11/26	39.20
1981/11/27	36.20
1981/11/28	32.60
1981/11/29	30.20
1981/11/30	29.00
1981/12/01	27.50
1981/12/02	25.50
1981/12/03	24.50
1981/12/04	23.00
1981/12/05	23.00
1981/12/06	22.50
1981/12/07	21.50
1981/12/08	21.00
1981/12/09	21.00
1981/12/10	21.00
1981/12/11	20.00
1981/12/12	18.60
1981/12/13	18.20
1981/12/14	17.80
1981/12/15	17.40
1981/12/16	17.40
1981/12/17	17.40
1981/12/18	17.00
1981/12/19	16.60
1981/12/20	15.80
1981/12/21	15.80
1981/12/22	14.60
1981/12/23	14.20
1981/12/24	14.20
1981/12/25	13.80
1981/12/26	13.80
1981/12/27	13.80
1981/12/28	13.40
1981/12/29	13.40
1981/12/30	13.00
1981/12/31	13.00
#===========================================
# Number of observations = 365 / 365
# Average = 79.41