Year Number 1970 620382.8125 1971 642000.25 1972 680956.9375 1973 718080.125 1974 735249.625 1975 776853.9375 1976 827203.125 1977 871545.9375 1978 941671.375 1979 990861.375 1980 991822.375 1981 1012513.5 1982 1037881.0625 1983 1088752.375 1984 1156583.5 1985 1174012.75 1986 1217286 1987 1224686.25 1988 1260761.75 1989 1278406.25 1990 1294390.875 1991 1353086.25 1992 1396163.75 1993 1440912.125 1994 1464580.75 1995 1528778.25 1996 1589264 1997 1653016.25 1998 1709960.375 1999 1787614.875 2000 1841183.875 2001 1919525 2002 2037962.5 2003 2154709.75 2004 2296359 2005 2394903.25 2006 2535913.75 2007 2679217.75 2008 2832853 2009 2942997 2010 3101902.75 2011 3276736.25 2012 3409787.25 2013 3555122.75 2014 3715671 2015 3872442 2016 4054646 2017 4220341 2018 4369384 2019 4401238 2020 4460887.5 2021 4556885.5 2022 4622675