Year | Value | 2022 | 15,205,483 | 2021 | 15,922,813 | 2020 | 16,513,728 | 2019 | 17,175,623 | 2018 | 17,839,014 | 2017 | 18,485,375 | 2016 | 18,986,249 | 2015 | 19,257,062 | 2014 | 19,344,959 | 2013 | 19,332,852 | 2012 | 19,159,802 | 2011 | 18,827,892 | 2010 | 18,517,829 | 2009 | 18,254,418 | 2008 | 17,933,666 | 2007 | 17,638,858 | 2006 | 17,473,707 | 2005 | 17,300,525 | 2004 | 17,098,615 | 2003 | 16,893,344 | 2002 | 16,706,998 | 2001 | 16,536,496 | 2000 | 16,353,340 | 1999 | 16,188,196 | 1998 | 16,093,476 | 1997 | 15,982,202 | 1996 | 15,800,625 | 1995 | 15,683,240 | 1994 | 15,705,873 | 1993 | 15,859,032 | 1992 | 16,149,677 | 1991 | 16,607,205 | 1990 | 17,109,044 | 1989 | 17,525,372 | 1988 | 17,769,351 | 1987 | 17,852,449 | 1986 | 17,773,196 | 1985 | 17,558,897 | 1984 | 17,310,003 | 1983 | 17,049,881 | 1982 | 16,738,495 | 1981 | 16,416,060 | 1980 | 16,113,626 | 1979 | 15,813,516 | 1978 | 15,444,037 | 1977 | 15,008,396 | 1976 | 14,496,527 | 1975 | 13,560,894 | 1974 | 12,248,938 | 1973 | 10,982,023 | 1972 | 10,005,839 | 1971 | 9,604,737 | 1970 | 10,005,827 | 1969 | 11,029,991 | 1968 | 12,337,589 | 1967 | 13,593,808 | 1966 | 14,295,312 | 1965 | 14,402,342 | 1964 | 14,053,642 | 1963 | 13,367,056 | 1962 | 12,708,775 | 1961 | 12,310,066 | 1960 | 12,319,260 |
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