Year Number 1970 234129.453125 1971 239422.078125 1972 265724.65625 1973 292235.84375 1974 307435.75 1975 336917.59375 1976 379154.75 1977 415806.15625 1978 468881.15625 1979 512010.34375 1980 563566.625 1981 609321.5625 1982 653700.8125 1983 737633.1875 1984 789819.8125 1985 850689.6875 1986 911963.3125 1987 972271.5625 1988 1029471 1989 1053305.25 1990 1114584.375 1991 1175934.75 1992 1207432.75 1993 1270445.25 1994 1343668.5 1995 1402879.375 1996 1483454.75 1997 1574520.625 1998 1640349.875 1999 1698956.25 2000 1770221.75 2001 1835389 2002 1875216.875 2003 1970057.875 2004 2015692.5 2005 2070161.125 2006 2137760.5 2007 2204615.5 2008 2275009.5 2009 2363854 2010 2382142.25 2011 2468507.5 2012 2485722.25 2013 2457841.5 2014 2425426.5 2015 2449884.25 2016 2451900 2017 2449423 2018 2496522.25 2019 2477292 2020 2522116 2021 2531564.25 2022 2501201