| Year | Value | | 2022 | 18,160,772 | | 2021 | 17,968,852 | | 2020 | 17,758,307 | | 2019 | 17,484,244 | | 2018 | 17,086,528 | | 2017 | 16,652,952 | | 2016 | 16,227,122 | | 2015 | 15,780,189 | | 2014 | 15,297,346 | | 2013 | 14,775,318 | | 2012 | 14,227,449 | | 2011 | 13,695,844 | | 2010 | 13,166,587 | | 2009 | 12,619,878 | | 2008 | 12,095,028 | | 2007 | 11,608,354 | | 2006 | 11,156,538 | | 2005 | 10,764,466 | | 2004 | 10,413,618 | | 2003 | 10,058,605 | | 2002 | 9,693,070 | | 2001 | 9,327,181 | | 2000 | 8,967,167 | | 1999 | 8,622,136 | | 1998 | 8,298,514 | | 1997 | 8,009,407 | | 1996 | 7,772,179 | | 1995 | 7,552,947 | | 1994 | 7,328,436 | | 1993 | 7,104,616 | | 1992 | 6,862,915 | | 1991 | 6,588,238 | | 1990 | 6,337,059 | | 1989 | 6,057,422 | | 1988 | 5,803,237 | | 1987 | 5,562,876 | | 1986 | 5,316,113 | | 1985 | 5,068,788 | | 1984 | 4,818,558 | | 1983 | 4,563,551 | | 1982 | 4,316,607 | | 1981 | 4,097,224 | | 1980 | 3,907,956 | | 1979 | 3,744,744 | | 1978 | 3,626,210 | | 1977 | 3,548,303 | | 1976 | 3,485,873 | | 1975 | 3,436,666 | | 1974 | 3,394,947 | | 1973 | 3,352,997 | | 1972 | 3,311,244 | | 1971 | 3,267,505 | | 1970 | 3,221,404 | | 1969 | 3,168,787 | | 1968 | 3,107,425 | | 1967 | 3,041,014 | | 1966 | 2,973,503 | | 1965 | 2,903,944 | | 1964 | 2,830,682 | | 1963 | 2,756,483 | | 1962 | 2,683,518 | | 1961 | 2,611,875 | | 1960 | 2,544,574 |
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