| Year | Value | | 2022 | 3,390,743 | | 2021 | 3,425,327 | | 2020 | 3,514,652 | | 2019 | 3,579,841 | | 2018 | 3,632,486 | | 2017 | 3,677,901 | | 2016 | 3,719,491 | | 2015 | 3,760,931 | | 2014 | 3,813,721 | | 2013 | 3,874,455 | | 2012 | 3,936,508 | | 2011 | 4,008,807 | | 2010 | 4,071,082 | | 2009 | 4,106,466 | | 2008 | 4,093,327 | | 2007 | 4,044,320 | | 2006 | 3,970,488 | | 2005 | 3,885,192 | | 2004 | 3,809,898 | | 2003 | 3,774,889 | | 2002 | 3,780,537 | | 2001 | 3,763,908 | | 2000 | 3,706,749 | | 1999 | 3,649,702 | | 1998 | 3,583,145 | | 1997 | 3,517,313 | | 1996 | 3,522,908 | | 1995 | 3,608,186 | | 1994 | 3,705,197 | | 1993 | 3,812,084 | | 1992 | 3,949,253 | | 1991 | 4,108,807 | | 1990 | 4,254,142 | | 1989 | 4,372,162 | | 1988 | 4,443,681 | | 1987 | 4,467,920 | | 1986 | 4,462,038 | | 1985 | 4,429,210 | | 1984 | 4,382,893 | | 1983 | 4,328,314 | | 1982 | 4,252,000 | | 1981 | 4,141,420 | | 1980 | 3,956,126 | | 1979 | 3,735,356 | | 1978 | 3,538,542 | | 1977 | 3,365,408 | | 1976 | 3,242,184 | | 1975 | 3,215,376 | | 1974 | 3,253,182 | | 1973 | 3,297,735 | | 1972 | 3,354,888 | | 1971 | 3,409,959 | | 1970 | 3,454,882 | | 1969 | 3,482,064 | | 1968 | 3,500,766 | | 1967 | 3,522,464 | | 1966 | 3,545,155 | | 1965 | 3,583,276 | | 1964 | 3,626,479 | | 1963 | 3,657,757 | | 1962 | 3,671,568 | | 1961 | 3,674,769 | | 1960 | 3,680,297 |
|