1981/01/01	17.60
1981/01/02	17.60
1981/01/03	17.20
1981/01/04	16.80
1981/01/05	16.40
1981/01/06	16.00
1981/01/07	15.60
1981/01/08	15.20
1981/01/09	15.20
1981/01/10	14.80
1981/01/11	14.80
1981/01/12	14.40
1981/01/13	14.00
1981/01/14	14.00
1981/01/15	13.60
1981/01/16	13.60
1981/01/17	13.60
1981/01/18	13.60
1981/01/19	13.60
1981/01/20	13.20
1981/01/21	13.20
1981/01/22	13.20
1981/01/23	13.20
1981/01/24	12.80
1981/01/25	12.80
1981/01/26	12.80
1981/01/27	12.40
1981/01/28	12.40
1981/01/29	12.00
1981/01/30	12.00
1981/01/31	11.60
1981/02/01	11.60
1981/02/02	11.20
1981/02/03	11.20
1981/02/04	10.80
1981/02/05	10.80
1981/02/06	10.80
1981/02/07	10.40
1981/02/08	10.40
1981/02/09	10.40
1981/02/10	10.40
1981/02/11	10.00
1981/02/12	10.00
1981/02/13	10.00
1981/02/14	10.00
1981/02/15	9.60
1981/02/16	9.60
1981/02/17	9.20
1981/02/18	9.20
1981/02/19	9.20
1981/02/20	9.20
1981/02/21	9.20
1981/02/22	8.80
1981/02/23	8.40
1981/02/24	8.40
1981/02/25	8.00
1981/02/26	8.00
1981/02/27	7.70
1981/02/28	7.70
1981/03/01	7.70
1981/03/02	7.70
1981/03/03	7.40
1981/03/04	7.40
1981/03/05	7.10
1981/03/06	7.10
1981/03/07	6.80
1981/03/08	6.80
1981/03/09	6.80
1981/03/10	6.80
1981/03/11	6.50
1981/03/12	6.50
1981/03/13	6.50
1981/03/14	6.50
1981/03/15	6.50
1981/03/16	6.50
1981/03/17	6.50
1981/03/18	6.50
1981/03/19	6.20
1981/03/20	6.20
1981/03/21	5.60
1981/03/22	5.30
1981/03/23	5.30
1981/03/24	5.00
1981/03/25	5.00
1981/03/26	5.00
1981/03/27	5.00
1981/03/28	5.00
1981/03/29	4.70
1981/03/30	4.70
1981/03/31	4.70
1981/04/01	5.00
1981/04/02	4.80
1981/04/03	4.80
1981/04/04	4.80
1981/04/05	5.00
1981/04/06	5.00
1981/04/07	4.80
1981/04/08	5.20
1981/04/09	5.80
1981/04/10	5.50
1981/04/11	5.00
1981/04/12	4.80
1981/04/13	4.80
1981/04/14	4.80
1981/04/15	5.00
1981/04/16	5.20
1981/04/17	5.00
1981/04/18	4.80
1981/04/19	5.20
1981/04/20	6.50
1981/04/21	5.80
1981/04/22	5.50
1981/04/23	5.50
1981/04/24	5.20
1981/04/25	5.00
1981/04/26	4.50
1981/04/27	4.80
1981/04/28	5.00
1981/04/29	29.20
1981/04/30	17.00
1981/05/01	14.60
1981/05/02	11.40
1981/05/03	9.20
1981/05/04	7.80
1981/05/05	7.20
1981/05/06	7.50
1981/05/07	11.80
1981/05/08	11.40
1981/05/09	38.20
1981/05/10	28.60
1981/05/11	20.20
1981/05/12	19.00
1981/05/13	16.20
1981/05/14	21.40
1981/05/15	22.60
1981/05/16	17.00
1981/05/17	12.60
1981/05/18	11.80
1981/05/19	18.60
1981/05/20	44.90
1981/05/21	64.60
1981/05/22	50.20
1981/05/23	73.70
1981/05/24	317.30
1981/05/25	757.60
1981/05/26	543.70
1981/05/27	308.80
1981/05/28	196.60
1981/05/29	138.50
1981/05/30	122.40
1981/05/31	117.00
1981/06/01	117.00
1981/06/02	147.60
1981/06/03	139.80
1981/06/04	119.00
1981/06/05	100.00
1981/06/06	75.50
1981/06/07	62.20
1981/06/08	52.60
1981/06/09	44.20
1981/06/10	37.00
1981/06/11	32.80
1981/06/12	35.20
1981/06/13	37.60
1981/06/14	45.60
1981/06/15	44.20
1981/06/16	37.00
1981/06/17	37.00
1981/06/18	41.40
1981/06/19	35.80
1981/06/20	56.60
1981/06/21	70.20
1981/06/22	65.40
1981/06/23	59.00
1981/06/24	54.20
1981/06/25	67.00
1981/06/26	90.00
1981/06/27	78.20
1981/06/28	67.80
1981/06/29	55.00
1981/06/30	51.00
1981/07/01	47.00
1981/07/02	38.80
1981/07/03	32.20
1981/07/04	27.00
1981/07/05	24.50
1981/07/06	27.00
1981/07/07	412.70
1981/07/08	1274.90
1981/07/09	1485.00
1981/07/10	702.40
1981/07/11	405.10
1981/07/12	624.20
1981/07/13	514.30
1981/07/14	310.50
1981/07/15	217.60
1981/07/16	177.50
1981/07/17	171.00
1981/07/18	173.60
1981/07/19	177.50
1981/07/20	351.30
1981/07/21	552.10
1981/07/22	658.70
1981/07/23	836.00
1981/07/24	520.60
1981/07/25	358.10
1981/07/26	573.10
1981/07/27	642.60
1981/07/28	450.00
1981/07/29	416.50
1981/07/30	363.20
1981/07/31	422.20
1981/08/01	587.80
1981/08/02	552.10
1981/08/03	399.40
1981/08/04	329.20
1981/08/05	313.90
1981/08/06	711.60
1981/08/07	915.50
1981/08/08	858.00
1981/08/09	535.30
1981/08/10	379.00
1981/08/11	552.10
1981/08/12	812.00
1981/08/13	667.90
1981/08/14	484.90
1981/08/15	341.10
1981/08/16	270.00
1981/08/17	221.80
1981/08/18	188.20
1981/08/19	223.20
1981/08/20	244.50
1981/08/21	430.00
1981/08/22	371.80
1981/08/23	262.50
1981/08/24	214.80
1981/08/25	192.40
1981/08/26	224.60
1981/08/27	200.80
1981/08/28	172.30
1981/08/29	151.50
1981/08/30	147.60
1981/08/31	127.20
1981/09/01	108.00
1981/09/02	113.00
1981/09/03	556.30
1981/09/04	403.20
1981/09/05	289.20
1981/09/06	267.00
1981/09/07	298.80
1981/09/08	302.00
1981/09/09	332.60
1981/09/10	267.00
1981/09/11	206.40
1981/09/12	171.00
1981/09/13	154.10
1981/09/14	148.90
1981/09/15	130.80
1981/09/16	106.00
1981/09/17	93.00
1981/09/18	90.00
1981/09/19	96.00
1981/09/20	93.00
1981/09/21	85.00
1981/09/22	78.20
1981/09/23	81.00
1981/09/24	97.00
1981/09/25	103.00
1981/09/26	96.00
1981/09/27	98.00
1981/09/28	87.00
1981/09/29	76.40
1981/09/30	68.60
1981/10/01	64.60
1981/10/02	67.80
1981/10/03	76.40
1981/10/04	76.40
1981/10/05	85.00
1981/10/06	130.80
1981/10/07	128.40
1981/10/08	158.00
1981/10/09	155.40
1981/10/10	180.10
1981/10/11	261.00
1981/10/12	416.50
1981/10/13	336.00
1981/10/14	224.60
1981/10/15	165.80
1981/10/16	142.40
1981/10/17	176.20
1981/10/18	286.00
1981/10/19	279.60
1981/10/20	310.50
1981/10/21	273.20
1981/10/22	210.60
1981/10/23	165.80
1981/10/24	152.80
1981/10/25	141.10
1981/10/26	129.60
1981/10/27	141.10
1981/10/28	123.60
1981/10/29	109.00
1981/10/30	98.00
1981/10/31	84.00
1981/11/01	74.60
1981/11/02	68.60
1981/11/03	65.40
1981/11/04	60.60
1981/11/05	62.20
1981/11/06	66.20
1981/11/07	64.60
1981/11/08	59.80
1981/11/09	57.40
1981/11/10	55.00
1981/11/11	53.40
1981/11/12	52.60
1981/11/13	48.60
1981/11/14	51.00
1981/11/15	53.40
1981/11/16	56.60
1981/11/17	71.00
1981/11/18	102.00
1981/11/19	101.00
1981/11/20	276.40
1981/11/21	203.60
1981/11/22	135.90
1981/11/23	105.00
1981/11/24	87.00
1981/11/25	75.50
1981/11/26	67.00
1981/11/27	62.20
1981/11/28	58.20
1981/11/29	54.20
1981/11/30	49.40
1981/12/01	46.30
1981/12/02	44.20
1981/12/03	41.40
1981/12/04	39.40
1981/12/05	38.20
1981/12/06	36.40
1981/12/07	35.80
1981/12/08	34.00
1981/12/09	33.40
1981/12/10	32.20
1981/12/11	31.60
1981/12/12	29.80
1981/12/13	29.20
1981/12/14	28.60
1981/12/15	27.50
1981/12/16	27.00
1981/12/17	26.00
1981/12/18	25.00
1981/12/19	24.50
1981/12/20	24.00
1981/12/21	23.50
1981/12/22	22.20
1981/12/23	21.00
1981/12/24	21.00
1981/12/25	20.60
1981/12/26	20.60
1981/12/27	19.80
1981/12/28	19.00
1981/12/29	19.00
1981/12/30	18.60
1981/12/31	18.60
#===========================================
# Number of observations = 365 / 365
# Average = 122.96