| Year | Value | | 2024 | 41,288,599 | | 2023 | 40,083,484 | | 2022 | 38,935,934 | | 2021 | 38,239,864 | | 2020 | 38,028,638 | | 2019 | 37,618,495 | | 2018 | 37,072,620 | | 2017 | 36,545,075 | | 2016 | 36,110,803 | | 2015 | 35,704,498 | | 2014 | 35,434,066 | | 2013 | 35,080,992 | | 2012 | 34,713,395 | | 2011 | 34,339,221 | | 2010 | 34,005,902 | | 2009 | 33,630,069 | | 2008 | 33,247,298 | | 2007 | 32,888,886 | | 2006 | 32,571,193 | | 2005 | 32,242,732 | | 2004 | 31,938,807 | | 2003 | 31,642,461 | | 2002 | 31,359,199 | | 2001 | 31,020,855 | | 2000 | 30,685,730 | | 1999 | 30,401,286 | | 1998 | 30,155,173 | | 1997 | 29,905,948 | | 1996 | 29,610,218 | | 1995 | 29,302,311 | | 1994 | 29,000,663 | | 1993 | 28,684,764 | | 1992 | 28,371,264 | | 1991 | 28,037,420 | | 1990 | 27,691,138 | | 1989 | 27,276,781 | | 1988 | 26,791,747 | | 1987 | 26,446,601 | | 1986 | 26,100,278 | | 1985 | 25,842,116 | | 1984 | 25,607,053 | | 1983 | 25,366,451 | | 1982 | 25,116,942 | | 1981 | 24,819,915 | | 1980 | 24,515,667 | | 1979 | 24,201,544 | | 1978 | 23,963,203 | | 1977 | 23,725,843 | | 1976 | 23,449,808 |
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