| Year | Value | | 2022 | 25,492,648 | | 2021 | 25,038,908 | | 2020 | 24,542,975 | | 2019 | 23,966,692 | | 2018 | 23,353,388 | | 2017 | 22,697,541 | | 2016 | 22,003,688 | | 2015 | 21,277,618 | | 2014 | 20,524,717 | | 2013 | 19,631,927 | | 2012 | 18,631,948 | | 2011 | 17,673,706 | | 2010 | 16,756,598 | | 2009 | 15,886,179 | | 2008 | 15,217,231 | | 2007 | 14,745,425 | | 2006 | 14,328,983 | | 2005 | 13,980,445 | | 2004 | 13,701,738 | | 2003 | 13,490,221 | | 2002 | 13,318,833 | | 2001 | 13,142,439 | | 2000 | 12,933,548 | | 1999 | 12,690,467 | | 1998 | 12,408,379 | | 1997 | 12,093,598 | | 1996 | 11,777,396 | | 1995 | 11,475,315 | | 1994 | 11,174,581 | | 1993 | 10,863,187 | | 1992 | 10,548,701 | | 1991 | 10,239,528 | | 1990 | 9,941,179 | | 1989 | 9,655,747 | | 1988 | 9,385,463 | | 1987 | 9,132,775 | | 1986 | 8,897,257 | | 1985 | 8,678,371 | | 1984 | 8,477,166 | | 1983 | 8,294,832 | | 1982 | 8,126,671 | | 1981 | 7,964,369 | | 1980 | 7,803,194 | | 1979 | 7,642,449 | | 1978 | 7,479,702 | | 1977 | 7,317,809 | | 1976 | 7,166,938 | | 1975 | 7,031,812 | | 1974 | 6,911,960 | | 1973 | 6,812,170 | | 1972 | 6,722,165 | | 1971 | 6,611,582 | | 1970 | 6,463,085 | | 1969 | 6,277,049 | | 1968 | 6,045,074 | | 1967 | 5,789,438 | | 1966 | 5,563,559 | | 1965 | 5,398,189 | | 1964 | 5,290,356 | | 1963 | 5,246,833 | | 1962 | 5,247,319 | | 1961 | 5,217,391 | | 1960 | 5,108,152 |
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