| Year | Value | | 2022 | 16,012,938 | | 2021 | 15,763,076 | | 2020 | 15,540,639 | | 2019 | 15,314,054 | | 2018 | 15,072,630 | | 2017 | 14,813,043 | | 2016 | 14,525,255 | | 2015 | 14,204,148 | | 2014 | 13,848,519 | | 2013 | 13,463,629 | | 2012 | 13,065,161 | | 2011 | 12,666,865 | | 2010 | 12,277,073 | | 2009 | 11,906,487 | | 2008 | 11,538,168 | | 2007 | 11,180,903 | | 2006 | 10,833,293 | | 2005 | 10,496,201 | | 2004 | 10,164,906 | | 2003 | 9,820,912 | | 2002 | 9,462,202 | | 2001 | 9,098,592 | | 2000 | 8,740,587 | | 1999 | 8,402,937 | | 1998 | 8,102,622 | | 1997 | 7,844,454 | | 1996 | 7,619,806 | | 1995 | 7,415,976 | | 1994 | 7,221,910 | | 1993 | 7,036,741 | | 1992 | 6,855,385 | | 1991 | 6,673,913 | | 1990 | 6,489,296 | | 1989 | 6,308,452 | | 1988 | 6,141,892 | | 1987 | 5,990,698 | | 1986 | 5,853,287 | | 1985 | 5,730,302 | | 1984 | 5,618,781 | | 1983 | 5,511,228 | | 1982 | 5,404,352 | | 1981 | 5,296,207 | | 1980 | 5,183,427 | | 1979 | 5,064,904 | | 1978 | 4,941,144 | | 1977 | 4,812,114 | | 1976 | 4,678,797 | | 1975 | 4,542,456 | | 1974 | 4,402,867 | | 1973 | 4,261,727 | | 1972 | 4,126,587 | | 1971 | 4,006,464 | | 1970 | 3,909,188 | | 1969 | 3,831,776 | | 1968 | 3,767,207 | | 1967 | 3,711,755 | | 1966 | 3,657,180 | | 1965 | 3,596,473 | | 1964 | 3,527,966 | | 1963 | 3,451,972 | | 1962 | 3,369,935 | | 1961 | 3,285,918 | | 1960 | 3,203,081 |
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