| Year | Value | | 2022 | 3,639,986 | | 2021 | 3,810,903 | | 2020 | 4,032,630 | | 2019 | 4,259,400 | | 2018 | 4,433,365 | | 2017 | 4,556,374 | | 2016 | 4,585,108 | | 2015 | 4,495,976 | | 2014 | 4,375,318 | | 2013 | 4,271,161 | | 2012 | 4,147,373 | | 2011 | 3,995,381 | | 2010 | 3,887,888 | | 2009 | 3,798,482 | | 2008 | 3,679,758 | | 2007 | 3,573,037 | | 2006 | 3,483,054 | | 2005 | 3,404,342 | | 2004 | 3,304,356 | | 2003 | 3,196,511 | | 2002 | 3,158,715 | | 2001 | 3,205,065 | | 2000 | 3,297,009 | | 1999 | 3,413,389 | | 1998 | 3,523,274 | | 1997 | 3,638,607 | | 1996 | 3,798,477 | | 1995 | 4,010,506 | | 1994 | 4,272,078 | | 1993 | 4,600,037 | | 1992 | 5,002,144 | | 1991 | 5,380,881 | | 1990 | 5,650,975 | | 1989 | 5,854,193 | | 1988 | 5,963,102 | | 1987 | 5,955,171 | | 1986 | 5,855,734 | | 1985 | 5,746,216 | | 1984 | 5,629,473 | | 1983 | 5,480,569 | | 1982 | 5,358,085 | | 1981 | 5,288,942 | | 1980 | 5,244,665 | | 1979 | 5,213,681 | | 1978 | 5,180,353 | | 1977 | 5,142,052 | | 1976 | 5,092,959 | | 1975 | 5,009,801 | | 1974 | 4,904,479 | | 1973 | 4,803,483 | | 1972 | 4,709,755 | | 1971 | 4,652,230 | | 1970 | 4,612,440 | | 1969 | 4,632,899 | | 1968 | 4,800,901 | | 1967 | 5,058,012 | | 1966 | 5,360,260 | | 1965 | 5,699,444 | | 1964 | 6,004,275 | | 1963 | 6,233,420 | | 1962 | 6,383,201 | | 1961 | 6,459,524 | | 1960 | 6,488,877 |
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