Year	Units
1962-01-01	508.011850548541
1963-01-01	542.144414544953
1964-01-01	673.372524667081
1965-01-01	650.341328572414
1966-01-01	657.548933105637
1967-01-01	597.899792141034
1968-01-01	712.641542468778
1969-01-01	810.234164769199
1970-01-01	901.530488856689
1971-01-01	1045.019811288210
1972-01-01	1139.050054336580
1973-01-01	1222.641697716140
1974-01-01	1277.734307079280
1975-01-01	1340.365905092110
1976-01-01	1487.334760746570
1977-01-01	1581.530695853170
1978-01-01	1686.496614745050
1979-01-01	1705.136971296490
1980-01-01	1713.173036120890
1981-01-01	1906.121437935560
1982-01-01	2137.096167115160
1983-01-01	2193.928543089770
1984-01-01	2369.147894673290
1985-01-01	2422.003661250260
1986-01-01	2730.605119712960
1987-01-01	2705.751310977710
1988-01-01	2804.089547540190
1989-01-01	2848.412173118060
1990-01-01	3201.833333333330
1991-01-01	3588.750000000000
1992-01-01	3104.000000000000
1993-01-01	2472.833333333330
1994-01-01	2423.500000000000
1995-01-01	2335.750000000000
1996-01-01	2498.333333333330
1997-01-01	2618.166666666670
1998-01-01	2994.000000000000
1999-01-01	3373.000000000000
2000-01-01	3491.333333333330
2001-01-01	3569.416666666670
2002-01-01	3616.916666666670
2003-01-01	3635.000000000000
2004-01-01	4019.500000000000
2005-01-01	4043.083333333330
2006-01-01	4236.416666666670
2007-01-01	4277.666666666670
2008-01-01	4363.250000000000
2009-01-01	3938.750000000000
2010-01-01	4143.833333333330
2011-01-01	4156.750000000000
2012-01-01	4199.833333333330
2013-01-01	3885.333333333330
2014-01-01	4149.416666666670
2015-01-01	3872.750000000000
2016-01-01	4213.416666666670
2017-01-01	4397.916666666670