| Year | Value | | 2022 | 16,340,926 | | 2021 | 16,373,042 | | 2020 | 16,397,543 | | 2019 | 16,364,915 | | 2018 | 16,248,172 | | 2017 | 16,058,514 | | 2016 | 15,794,588 | | 2015 | 15,480,749 | | 2014 | 15,144,522 | | 2013 | 14,737,063 | | 2012 | 14,264,155 | | 2011 | 13,794,898 | | 2010 | 13,305,976 | | 2009 | 12,784,542 | | 2008 | 12,301,402 | | 2007 | 11,854,528 | | 2006 | 11,436,343 | | 2005 | 11,072,514 | | 2004 | 10,757,261 | | 2003 | 10,475,990 | | 2002 | 10,237,642 | | 2001 | 9,995,914 | | 2000 | 9,723,055 | | 1999 | 9,450,679 | | 1998 | 9,181,376 | | 1997 | 8,919,586 | | 1996 | 8,663,330 | | 1995 | 8,402,214 | | 1994 | 8,142,556 | | 1993 | 7,920,769 | | 1992 | 7,691,697 | | 1991 | 7,433,289 | | 1990 | 7,157,559 | | 1989 | 6,895,258 | | 1988 | 6,682,288 | | 1987 | 6,475,647 | | 1986 | 6,249,457 | | 1985 | 6,010,028 | | 1984 | 5,773,870 | | 1983 | 5,529,993 | | 1982 | 5,288,132 | | 1981 | 5,033,249 | | 1980 | 4,784,877 | | 1979 | 4,561,633 | | 1978 | 4,359,597 | | 1977 | 4,180,010 | | 1976 | 4,005,679 | | 1975 | 3,861,434 | | 1974 | 3,761,434 | | 1973 | 3,698,064 | | 1972 | 3,663,502 | | 1971 | 3,646,289 | | 1970 | 3,630,679 | | 1969 | 3,611,715 | | 1968 | 3,587,899 | | 1967 | 3,555,063 | | 1966 | 3,514,537 | | 1965 | 3,467,668 | | 1964 | 3,412,655 | | 1963 | 3,349,901 | | 1962 | 3,284,774 | | 1961 | 3,221,031 | | 1960 | 3,160,411 |
|