| Year | Value | | 2024 | 40,583,164 | | 2023 | 39,390,799 | | 2022 | 38,222,876 | | 2021 | 37,140,230 | | 2020 | 36,134,863 | | 2019 | 35,111,408 | | 2018 | 34,085,182 | | 2017 | 33,090,921 | | 2016 | 32,109,010 | | 2015 | 31,159,379 | | 2014 | 30,226,309 | | 2013 | 29,312,952 | | 2012 | 28,433,647 | | 2011 | 27,582,897 | | 2010 | 26,754,387 | | 2009 | 25,927,724 | | 2008 | 25,111,941 | | 2007 | 24,318,082 | | 2006 | 23,543,083 | | 2005 | 22,790,085 | | 2004 | 22,095,167 | | 2003 | 21,456,379 | | 2002 | 20,835,086 | | 2001 | 20,226,147 | | 2000 | 19,624,141 | | 1999 | 19,029,420 | | 1998 | 18,446,013 | | 1997 | 17,873,936 | | 1996 | 17,313,177 | | 1995 | 16,740,058 | | 1994 | 16,149,147 | | 1993 | 15,563,914 | | 1992 | 14,989,494 | | 1991 | 14,430,201 | | 1990 | 13,887,862 | | 1989 | 13,364,174 | | 1988 | 12,859,708 | | 1987 | 12,369,912 | | 1986 | 11,901,040 | | 1985 | 11,453,825 | | 1984 | 11,025,597 | | 1983 | 10,621,499 | | 1982 | 10,241,006 | | 1981 | 9,882,362 | | 1980 | 9,543,358 | | 1979 | 9,224,194 | | 1978 | 8,926,586 | | 1977 | 8,648,222 | | 1976 | 8,384,113 |
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