Annual Units
1962-01-01 508.0118505485410
1963-01-01 542.1444145449530
1964-01-01 673.3725246670809
1965-01-01 650.3413285724140
1966-01-01 657.5489331056370
1967-01-01 597.8997921410339
1968-01-01 712.6415424687780
1969-01-01 810.2341647691990
1970-01-01 901.5304888566890
1971-01-01 1045.0198112882101
1972-01-01 1139.0500543365800
1973-01-01 1222.6416977161400
1974-01-01 1277.7343070792800
1975-01-01 1340.3659050921099
1976-01-01 1487.3347607465698
1977-01-01 1581.5306958531700
1978-01-01 1686.4966147450500
1979-01-01 1705.1369712964900
1980-01-01 1713.1730361208900
1981-01-01 1906.1214379355600
1982-01-01 2137.0961671151600
1983-01-01 2193.9285430897703
1984-01-01 2369.1478946732900
1985-01-01 2422.0036612502600
1986-01-01 2730.6051197129600
1987-01-01 2705.7513109777100
1988-01-01 2804.0895475401900
1989-01-01 2848.4121731180600
1990-01-01 3201.8333333333300
1991-01-01 3588.7500000000000
1992-01-01 3104.0000000000000
1993-01-01 2472.8333333333300
1994-01-01 2423.5000000000000
1995-01-01 2335.7500000000000
1996-01-01 2498.3333333333300
1997-01-01 2618.1666666666697
1998-01-01 2994.0000000000000
1999-01-01 3373.0000000000000
2000-01-01 3491.3333333333300
2001-01-01 3569.4166666666697
2002-01-01 3616.9166666666700
2003-01-01 3635.0000000000000
2004-01-01 4019.5000000000000
2005-01-01 4043.0833333333300
2006-01-01 4236.4166666666700
2007-01-01 4277.6666666666710
2008-01-01 4363.2500000000000
2009-01-01 3938.7500000000000
2010-01-01 4143.8333333333290
2011-01-01 4156.7500000000000
2012-01-01 4199.8333333333290
2013-01-01 3885.3333333333300
2014-01-01 4149.4166666666700
2015-01-01 3872.7500000000000
2016-01-01 4213.4166666666700
2017-01-01 4397.9166666666700