Year Number 1970 707141.5625 1971 750816.375 1972 844026.125 1973 907052.9375 1974 1072422.125 1975 1133965.5 1976 1243163.25 1977 1345482.5 1978 1392370.875 1979 1436365.75 1980 1462456.375 1981 1495293.625 1982 1538222.125 1983 1570433.125 1984 1614484 1985 1658355 1986 1731722.75 1987 1802464 1988 1858036.375 1989 1903875.125 1990 1944375.875 1991 1973417.375 1992 2014117.375 1993 2048232 1994 2101466 1995 2143163 1996 2228654.25 1997 2267320.75 1998 2386337.25 1999 2473079 2000 2501008.25 2001 2453142.25 2002 2894199.75 2003 3014679.75 2004 3117425 2005 3193036 2006 2847787.25 2007 2959177.75 2008 3134425.5 2009 3176076.75 2010 3252757.5 2011 3309091.75 2012 3344129.5 2013 3379653.5 2014 3515941 2015 3524387.5 2016 3554688.25 2017 3537295 2018 3567972 2019 3590139.5 2020 3590565.75 2021 3621199.75 2022 3675824