| Year | Value | | 2022 | 21,074,984 | | 2021 | 20,655,834 | | 2020 | 20,367,788 | | 2019 | 20,039,819 | | 2018 | 19,587,499 | | 2017 | 19,100,866 | | 2016 | 18,545,276 | | 2015 | 17,934,431 | | 2014 | 17,303,895 | | 2013 | 16,705,159 | | 2012 | 16,177,235 | | 2011 | 15,699,289 | | 2010 | 15,243,817 | | 2009 | 14,748,396 | | 2008 | 14,172,038 | | 2007 | 13,558,604 | | 2006 | 12,960,370 | | 2005 | 12,447,890 | | 2004 | 12,043,207 | | 2003 | 11,701,754 | | 2002 | 11,375,365 | | 2001 | 11,056,997 | | 2000 | 10,743,131 | | 1999 | 10,429,439 | | 1998 | 10,123,129 | | 1997 | 9,835,000 | | 1996 | 9,558,779 | | 1995 | 9,299,771 | | 1994 | 9,058,936 | | 1993 | 8,817,680 | | 1992 | 8,598,509 | | 1991 | 8,362,234 | | 1990 | 8,031,529 | | 1989 | 7,690,574 | | 1988 | 7,365,486 | | 1987 | 7,062,413 | | 1986 | 6,773,395 | | 1985 | 6,503,655 | | 1984 | 6,252,000 | | 1983 | 6,018,069 | | 1982 | 5,796,799 | | 1981 | 5,575,677 | | 1980 | 5,365,656 | | 1979 | 5,161,294 | | 1978 | 4,965,955 | | 1977 | 4,773,230 | | 1976 | 4,584,760 | | 1975 | 4,399,460 | | 1974 | 4,224,610 | | 1973 | 4,061,916 | | 1972 | 3,912,012 | | 1971 | 3,762,602 | | 1970 | 3,617,759 | | 1969 | 3,485,128 | | 1968 | 3,359,749 | | 1967 | 3,239,816 | | 1966 | 3,127,551 | | 1965 | 3,014,035 | | 1964 | 2,902,418 | | 1963 | 2,794,604 | | 1962 | 2,693,047 | | 1961 | 2,596,761 | | 1960 | 2,512,979 |
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