| Year | Value | | 2022 | 19,044,648 | | 2021 | 18,224,347 | | 2020 | 17,984,684 | | 2019 | 17,892,721 | | 2018 | 17,575,737 | | 2017 | 17,227,809 | | 2016 | 16,950,349 | | 2015 | 16,597,015 | | 2014 | 16,176,937 | | 2013 | 15,803,768 | | 2012 | 15,450,607 | | 2011 | 15,116,614 | | 2010 | 14,902,567 | | 2009 | 14,794,273 | | 2008 | 14,687,178 | | 2007 | 14,526,423 | | 2006 | 14,302,701 | | 2005 | 13,929,232 | | 2004 | 13,426,104 | | 2003 | 12,979,541 | | 2002 | 12,584,277 | | 2001 | 12,150,466 | | 2000 | 11,811,680 | | 1999 | 11,484,796 | | 1998 | 10,917,300 | | 1997 | 10,234,141 | | 1996 | 9,635,409 | | 1995 | 9,101,489 | | 1994 | 8,829,112 | | 1993 | 8,941,256 | | 1992 | 9,249,240 | | 1991 | 9,515,065 | | 1990 | 9,650,804 | | 1989 | 9,630,681 | | 1988 | 9,487,206 | | 1987 | 9,297,322 | | 1986 | 9,074,125 | | 1985 | 8,861,291 | | 1984 | 8,653,317 | | 1983 | 8,425,644 | | 1982 | 8,216,243 | | 1981 | 8,036,698 | | 1980 | 7,848,812 | | 1979 | 7,644,105 | | 1978 | 7,433,325 | | 1977 | 7,177,943 | | 1976 | 6,910,446 | | 1975 | 6,678,063 | | 1974 | 6,462,769 | | 1973 | 6,274,725 | | 1972 | 6,110,189 | | 1971 | 5,969,654 | | 1970 | 5,851,231 | | 1969 | 5,782,837 | | 1968 | 5,748,943 | | 1967 | 5,717,545 | | 1966 | 5,652,544 | | 1965 | 5,578,541 | | 1964 | 5,505,680 | | 1963 | 5,408,438 | | 1962 | 5,312,671 | | 1961 | 5,221,611 | | 1960 | 5,120,261 |
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