| Year | Value | | 2024 | 42,685,629 | | 2023 | 42,606,561 | | 2022 | 42,453,487 | | 2021 | 42,065,122 | | 2020 | 41,714,021 | | 2019 | 41,335,957 | | 2018 | 40,765,876 | | 2017 | 40,229,820 | | 2016 | 39,724,020 | | 2015 | 39,205,598 | | 2014 | 38,697,460 | | 2013 | 38,190,305 | | 2012 | 37,715,913 | | 2011 | 37,253,203 | | 2010 | 36,708,205 | | 2009 | 36,134,689 | | 2008 | 35,619,832 | | 2007 | 35,168,809 | | 2006 | 35,125,774 | | 2005 | 34,780,073 | | 2004 | 34,423,143 | | 2003 | 34,053,750 | | 2002 | 33,672,826 | | 2001 | 33,280,970 | | 2000 | 32,880,645 | | 1999 | 32,472,315 | | 1998 | 32,052,928 | | 1997 | 31,622,988 | | 1996 | 31,184,009 | | 1995 | 30,733,422 | | 1994 | 30,247,842 | | 1993 | 29,737,151 | | 1992 | 29,239,537 | | 1991 | 28,756,234 | | 1990 | 28,265,597 | | 1989 | 27,752,437 | | 1988 | 27,225,225 | | 1987 | 26,698,876 | | 1986 | 26,172,937 | | 1985 | 25,635,234 | | 1984 | 25,086,876 | | 1983 | 24,531,877 | | 1982 | 23,977,638 | | 1981 | 23,486,618 | | 1980 | 23,041,460 | | 1979 | 22,621,953 | | 1978 | 22,237,025 | | 1977 | 21,848,903 | | 1976 | 21,460,803 |
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