1981/01/01	2.20
1981/01/02	2.50
1981/01/03	2.40
1981/01/04	2.40
1981/01/05	3.00
1981/01/06	2.40
1981/01/07	2.30
1981/01/08	2.00
1981/01/09	2.10
1981/01/10	2.00
1981/01/11	1.60
1981/01/12	1.00
1981/01/13	1.00
1981/01/14	1.40
1981/01/15	1.80
1981/01/16	1.60
1981/01/17	2.30
1981/01/18	2.40
1981/01/19	2.70
1981/01/20	2.30
1981/01/21	2.80
1981/01/22	2.40
1981/01/23	2.30
1981/01/24	2.50
1981/01/25	2.30
1981/01/26	2.40
1981/01/27	2.30
1981/01/28	2.40
1981/01/29	2.70
1981/01/30	2.50
1981/01/31	2.30
1981/02/01	2.10
1981/02/02	2.10
1981/02/03	2.40
1981/02/04	2.40
1981/02/05	2.00
1981/02/06	2.10
1981/02/07	2.00
1981/02/08	1.80
1981/02/09	1.60
1981/02/10	1.70
1981/02/11	1.50
1981/02/12	1.60
1981/02/13	1.40
1981/02/14	1.20
1981/02/15	1.20
1981/02/16	1.20
1981/02/17	1.20
1981/02/18	1.30
1981/02/19	1.20
1981/02/20	1.00
1981/02/21	1.00
1981/02/22	1.00
1981/02/23	0.95
1981/02/24	0.95
1981/02/25	0.95
1981/02/26	0.85
1981/02/27	0.85
1981/02/28	0.75
1981/03/01	0.70
1981/03/02	0.65
1981/03/03	0.70
1981/03/04	0.65
1981/03/05	0.65
1981/03/06	0.60
1981/03/07	0.60
1981/03/08	0.65
1981/03/09	0.60
1981/03/10	0.60
1981/03/11	0.65
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	0.65
1981/03/21	0.60
1981/03/22	0.60
1981/03/23	0.55
1981/03/24	0.55
1981/03/25	0.55
1981/03/26	0.50
1981/03/27	0.50
1981/03/28	0.50
1981/03/29	0.50
1981/03/30	0.45
1981/03/31	0.55
1981/04/01	0.55
1981/04/02	0.50
1981/04/03	0.45
1981/04/04	0.45
1981/04/05	0.45
1981/04/06	0.45
1981/04/07	0.45
1981/04/08	0.45
1981/04/09	0.40
1981/04/10	0.40
1981/04/11	0.35
1981/04/12	0.35
1981/04/13	0.35
1981/04/14	0.35
1981/04/15	0.35
1981/04/16	0.35
1981/04/17	0.30
1981/04/18	0.30
1981/04/19	0.50
1981/04/20	0.45
1981/04/21	0.45
1981/04/22	0.45
1981/04/23	0.40
1981/04/24	0.45
1981/04/25	0.45
1981/04/26	0.45
1981/04/27	0.45
1981/04/28	0.45
1981/04/29	0.40
1981/04/30	0.40
1981/05/01	0.40
1981/05/02	0.40
1981/05/03	0.45
1981/05/04	0.55
1981/05/05	0.65
1981/05/06	0.60
1981/05/07	0.65
1981/05/08	0.70
1981/05/09	2.60
1981/05/10	3.00
1981/05/11	2.20
1981/05/12	1.70
1981/05/13	1.60
1981/05/14	1.50
1981/05/15	1.30
1981/05/16	1.20
1981/05/17	1.20
1981/05/18	1.00
1981/05/19	1.70
1981/05/20	1.80
1981/05/21	1.80
1981/05/22	2.10
1981/05/23	2.60
1981/05/24	5.55
1981/05/25	5.40
1981/05/26	5.10
1981/05/27	4.80
1981/05/28	7.90
1981/05/29	10.70
1981/05/30	11.70
1981/05/31	11.70
1981/06/01	9.90
1981/06/02	17.50
1981/06/03	24.30
1981/06/04	21.30
1981/06/05	12.10
1981/06/06	14.25
1981/06/07	11.10
1981/06/08	7.35
1981/06/09	11.30
1981/06/10	10.50
1981/06/11	19.75
1981/06/12	13.75
1981/06/13	10.50
1981/06/14	9.30
1981/06/15	7.90
1981/06/16	6.90
1981/06/17	5.55
1981/06/18	4.50
1981/06/19	5.40
1981/06/20	4.80
1981/06/21	3.45
1981/06/22	2.80
1981/06/23	2.70
1981/06/24	2.30
1981/06/25	2.50
1981/06/26	2.60
1981/06/27	2.50
1981/06/28	2.40
1981/06/29	2.60
1981/06/30	2.80
1981/07/01	2.80
1981/07/02	2.50
1981/07/03	2.50
1981/07/04	2.30
1981/07/05	2.30
1981/07/06	9.10
1981/07/07	71.20
1981/07/08	127.00
1981/07/09	145.00
1981/07/10	129.50
1981/07/11	77.20
1981/07/12	50.80
1981/07/13	30.30
1981/07/14	18.75
1981/07/15	12.30
1981/07/16	10.30
1981/07/17	10.10
1981/07/18	10.50
1981/07/19	12.50
1981/07/20	16.75
1981/07/21	39.70
1981/07/22	87.85
1981/07/23	79.60
1981/07/24	53.20
1981/07/25	53.60
1981/07/26	52.00
1981/07/27	41.10
1981/07/28	50.00
1981/07/29	70.00
1981/07/30	79.20
1981/07/31	95.95
1981/08/01	119.00
1981/08/02	145.00
1981/08/03	155.50
1981/08/04	153.50
1981/08/05	140.50
1981/08/06	125.00
1981/08/07	119.50
1981/08/08	120.50
1981/08/09	114.50
1981/08/10	97.30
1981/08/11	118.00
1981/08/12	155.50
1981/08/13	182.00
1981/08/14	176.50
1981/08/15	152.00
1981/08/16	92.80
1981/08/17	54.40
1981/08/18	34.80
1981/08/19	40.05
1981/08/20	64.80
1981/08/21	75.60
1981/08/22	61.60
1981/08/23	50.80
1981/08/24	66.80
1981/08/25	62.80
1981/08/26	46.40
1981/08/27	34.20
1981/08/28	27.00
1981/08/29	21.30
1981/08/30	16.00
1981/08/31	14.25
1981/09/01	15.75
1981/09/02	54.00
1981/09/03	96.40
1981/09/04	96.40
1981/09/05	96.40
1981/09/06	86.50
1981/09/07	93.70
1981/09/08	94.15
1981/09/09	95.50
1981/09/10	90.55
1981/09/11	82.45
1981/09/12	75.60
1981/09/13	54.00
1981/09/14	39.00
1981/09/15	25.20
1981/09/16	21.60
1981/09/17	18.00
1981/09/18	19.50
1981/09/19	19.50
1981/09/20	20.25
1981/09/21	42.85
1981/09/22	53.20
1981/09/23	43.55
1981/09/24	44.95
1981/09/25	44.60
1981/09/26	40.75
1981/09/27	40.75
1981/09/28	29.10
1981/09/29	23.10
1981/09/30	23.40
1981/10/01	21.00
1981/10/02	20.00
1981/10/03	20.00
1981/10/04	21.90
1981/10/05	20.50
1981/10/06	21.60
1981/10/07	18.75
1981/10/08	17.25
1981/10/09	16.25
1981/10/10	18.00
1981/10/11	15.25
1981/10/12	14.75
1981/10/13	15.50
1981/10/14	16.75
1981/10/15	14.00
1981/10/16	16.25
1981/10/17	20.25
1981/10/18	38.40
1981/10/19	45.65
1981/10/20	43.55
1981/10/21	38.10
1981/10/22	32.70
1981/10/23	27.90
1981/10/24	24.90
1981/10/25	23.10
1981/10/26	25.20
1981/10/27	21.90
1981/10/28	20.25
1981/10/29	19.00
1981/10/30	19.00
1981/10/31	17.00
1981/11/01	16.00
1981/11/02	16.50
1981/11/03	16.50
1981/11/04	16.50
1981/11/05	15.00
1981/11/06	17.00
1981/11/07	18.50
1981/11/08	22.50
1981/11/09	28.80
1981/11/10	34.50
1981/11/11	34.80
1981/11/12	30.90
1981/11/13	29.40
1981/11/14	26.10
1981/11/15	22.20
1981/11/16	28.80
1981/11/17	48.80
1981/11/18	74.80
1981/11/19	78.40
1981/11/20	64.80
1981/11/21	46.00
1981/11/22	32.40
1981/11/23	21.60
1981/11/24	18.00
1981/11/25	16.25
1981/11/26	12.70
1981/11/27	10.70
1981/11/28	8.90
1981/11/29	8.90
1981/11/30	9.70
1981/12/01	7.70
1981/12/02	7.05
1981/12/03	6.90
1981/12/04	6.60
1981/12/05	4.80
1981/12/06	4.80
1981/12/07	5.10
1981/12/08	6.15
1981/12/09	5.70
1981/12/10	5.10
1981/12/11	5.40
1981/12/12	5.55
1981/12/13	5.40
1981/12/14	6.45
1981/12/15	7.05
1981/12/16	7.70
1981/12/17	6.75
1981/12/18	6.45
1981/12/19	5.70
1981/12/20	5.25
1981/12/21	5.40
1981/12/22	4.95
1981/12/23	4.65
1981/12/24	4.65
1981/12/25	4.05
1981/12/26	4.05
1981/12/27	3.75
1981/12/28	4.05
1981/12/29	3.90
1981/12/30	4.05
1981/12/31	3.90
#===========================================
# Number of observations = 365 / 365
# Average = 22.06