| Year | Value | | 2024 | 20,025,126 | | 2023 | 19,440,467 | | 2022 | 18,866,431 | | 2021 | 18,330,840 | | 2020 | 17,830,293 | | 2019 | 17,319,592 | | 2018 | 16,805,311 | | 2017 | 16,308,544 | | 2016 | 15,821,476 | | 2015 | 15,350,464 | | 2014 | 14,891,086 | | 2013 | 14,444,586 | | 2012 | 14,015,248 | | 2011 | 13,601,487 | | 2010 | 13,198,893 | | 2009 | 12,797,754 | | 2008 | 12,402,249 | | 2007 | 12,016,807 | | 2006 | 11,639,970 | | 2005 | 11,273,485 | | 2004 | 10,934,846 | | 2003 | 10,623,084 | | 2002 | 10,320,054 | | 2001 | 10,023,178 | | 2000 | 9,729,548 | | 1999 | 9,439,211 | | 1998 | 9,154,150 | | 1997 | 8,874,400 | | 1996 | 8,600,048 | | 1995 | 8,319,513 | | 1994 | 8,029,811 | | 1993 | 7,742,827 | | 1992 | 7,461,464 | | 1991 | 7,187,499 | | 1990 | 6,922,051 | | 1989 | 6,665,930 | | 1988 | 6,419,178 | | 1987 | 6,179,426 | | 1986 | 5,947,542 | | 1985 | 5,726,366 | | 1984 | 5,516,847 | | 1983 | 5,319,194 | | 1982 | 5,133,165 | | 1981 | 4,957,869 | | 1980 | 4,792,061 | | 1979 | 4,635,832 | | 1978 | 4,489,940 | | 1977 | 4,353,208 | | 1976 | 4,223,270 | | 1975 | 4,099,759 |
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