| Year | Value | | 2022 | 20,017,675 | | 2021 | 19,473,125 | | 2020 | 18,927,715 | | 2019 | 18,380,477 | | 2018 | 17,835,893 | | 2017 | 17,298,054 | | 2016 | 16,767,761 | | 2015 | 16,248,230 | | 2014 | 15,737,793 | | 2013 | 15,234,976 | | 2012 | 14,744,658 | | 2011 | 14,265,814 | | 2010 | 13,792,086 | | 2009 | 13,318,087 | | 2008 | 12,852,966 | | 2007 | 12,402,073 | | 2006 | 11,971,567 | | 2005 | 11,564,870 | | 2004 | 11,188,040 | | 2003 | 10,837,973 | | 2002 | 10,508,294 | | 2001 | 10,191,964 | | 2000 | 9,891,136 | | 1999 | 9,621,238 | | 1998 | 9,372,430 | | 1997 | 9,133,156 | | 1996 | 8,902,019 | | 1995 | 8,684,135 | | 1994 | 8,474,216 | | 1993 | 8,270,917 | | 1992 | 8,074,337 | | 1991 | 7,880,466 | | 1990 | 7,686,401 | | 1989 | 7,491,275 | | 1988 | 7,294,325 | | 1987 | 7,095,185 | | 1986 | 6,890,967 | | 1985 | 6,686,449 | | 1984 | 6,488,072 | | 1983 | 6,291,070 | | 1982 | 6,090,818 | | 1981 | 5,897,481 | | 1980 | 5,720,438 | | 1979 | 5,553,462 | | 1978 | 5,391,355 | | 1977 | 5,233,292 | | 1976 | 5,079,672 | | 1975 | 4,931,249 | | 1974 | 4,789,038 | | 1973 | 4,653,289 | | 1972 | 4,523,581 | | 1971 | 4,399,919 | | 1970 | 4,281,671 | | 1969 | 4,159,007 | | 1968 | 4,029,173 | | 1967 | 3,901,288 | | 1966 | 3,777,680 | | 1965 | 3,658,024 | | 1964 | 3,542,764 | | 1963 | 3,431,381 | | 1962 | 3,323,427 | | 1961 | 3,219,451 | | 1960 | 3,119,430 |
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