Year	Units
1960-01-01	10437.2717785844
1961-01-01	10832.9912280702
1962-01-01	11766.4667271627
1963-01-01	13995.2805505142
1964-01-01	16236.7503024803
1965-01-01	18903.8461887477
1966-01-01	18655.5642770720
1967-01-01	19216.9393526921
1968-01-01	21761.9095583787
1969-01-01	25077.8434664247
1970-01-01	24251.1775559589
1971-01-01	21420.1188747731
1972-01-01	27047.9765577737
1973-01-01	27483.6790683606
1974-01-01	27057.4080459770
1975-01-01	29405.3649425287
1976-01-01	33910.5530852995
1977-01-01	34566.4848759831
1978-01-01	34200.3496672716
1979-01-01	34589.8620689655
1980-01-01	32827.7053841500
1981-01-01	29041.9705081670
1982-01-01	29196.6630369026
1983-01-01	28740.8077737447
1984-01-01	29824.2197519661
1985-01-01	30490.2279189353
1986-01-01	32985.0580762251
1987-01-01	33841.5500604961
1988-01-01	35749.2096188748
1989-01-01	37177.4754990926
1990-01-01	39458.8333333333
1991-01-01	38510.4166666667
1992-01-01	38849.5000000000
1993-01-01	31284.0833333333
1994-01-01	32279.0000000000
1995-01-01	29905.6666666667
1996-01-01	33113.2500000000
1997-01-01	33020.0000000000
1998-01-01	37677.4166666667
1999-01-01	40801.7500000000
2000-01-01	42933.6666666667
2001-01-01	40723.5833333333
2002-01-01	38964.0833333333
2003-01-01	38233.0000000000
2004-01-01	40396.4166666667
2005-01-01	40007.3333333333
2006-01-01	43845.0833333333
2007-01-01	43732.9166666667
2008-01-01	44662.2500000000
2009-01-01	39682.8333333333
2010-01-01	45611.6666666667
2011-01-01	47684.2500000000
2012-01-01	40561.4166666667
2013-01-01	40505.4166666667
2014-01-01	40244.9166666667
2015-01-01	41755.5000000000
2016-01-01	44960.0000000000
2017-01-01	45546.5000000000