| Year | Value | | 2023 | 8,098,401 | | 2022 | 8,191,420 | | 2021 | 8,299,446 | | 2020 | 8,399,917 | | 2019 | 8,484,420 | | 2018 | 8,557,916 | | 2017 | 8,612,042 | | 2016 | 8,629,579 | | 2015 | 8,612,358 | | 2014 | 8,562,833 | | 2013 | 8,476,830 | | 2012 | 8,357,941 | | 2011 | 8,215,714 | | 2010 | 8,059,162 | | 2009 | 7,893,770 | | 2008 | 7,729,249 | | 2007 | 7,572,071 | | 2006 | 7,421,838 | | 2005 | 7,280,310 | | 2004 | 7,147,763 | | 2003 | 7,020,340 | | 2002 | 6,906,177 | | 2001 | 6,819,719 | | 2000 | 6,760,583 | | 1999 | 6,721,684 | | 1998 | 6,690,658 | | 1997 | 6,651,308 | | 1996 | 6,588,790 | | 1995 | 6,497,642 | | 1994 | 6,380,803 | | 1993 | 6,241,881 | | 1992 | 6,085,726 | | 1991 | 5,922,418 | | 1990 | 5,755,618 | | 1989 | 5,584,863 | | 1988 | 5,414,540 | | 1987 | 5,246,367 | | 1986 | 5,081,002 | | 1985 | 4,916,788 | | 1984 | 4,755,876 | | 1983 | 4,586,968 | | 1982 | 4,401,705 | | 1981 | 4,206,896 | | 1980 | 4,003,464 | | 1979 | 3,799,750 | | 1978 | 3,617,556 | | 1977 | 3,467,031 | | 1976 | 3,343,185 | | 1975 | 3,244,420 |
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