| Year | Value | | 2022 | 33,575,039 | | 2021 | 32,807,002 | | 2020 | 32,038,217 | | 2019 | 31,255,632 | | 2018 | 30,451,166 | | 2017 | 29,639,704 | | 2016 | 28,826,081 | | 2015 | 28,015,534 | | 2014 | 27,217,778 | | 2013 | 26,439,316 | | 2012 | 25,678,117 | | 2011 | 24,935,851 | | 2010 | 24,217,375 | | 2009 | 23,520,104 | | 2008 | 22,849,463 | | 2007 | 22,207,751 | | 2006 | 21,596,721 | | 2005 | 21,036,255 | | 2004 | 20,501,248 | | 2003 | 19,965,686 | | 2002 | 19,449,504 | | 2001 | 18,942,742 | | 2000 | 18,439,845 | | 1999 | 17,939,997 | | 1998 | 17,449,972 | | 1997 | 16,961,687 | | 1996 | 16,455,736 | | 1995 | 15,946,838 | | 1994 | 15,426,535 | | 1993 | 14,891,422 | | 1992 | 14,352,337 | | 1991 | 13,817,257 | | 1990 | 13,291,089 | | 1989 | 12,767,819 | | 1988 | 12,245,391 | | 1987 | 11,727,481 | | 1986 | 11,180,415 | | 1985 | 10,616,712 | | 1984 | 10,071,860 | | 1983 | 9,552,860 | | 1982 | 9,060,643 | | 1981 | 8,595,873 | | 1980 | 8,159,500 | | 1979 | 7,750,942 | | 1978 | 7,369,388 | | 1977 | 7,012,682 | | 1976 | 6,682,214 | | 1975 | 6,341,768 | | 1974 | 6,086,141 | | 1973 | 5,914,144 | | 1972 | 5,751,496 | | 1971 | 5,596,839 | | 1970 | 5,449,386 | | 1969 | 5,306,556 | | 1968 | 5,166,773 | | 1967 | 5,030,391 | | 1966 | 4,899,040 | | 1965 | 4,660,676 | | 1964 | 4,401,648 | | 1963 | 4,148,851 | | 1962 | 3,912,031 | | 1961 | 3,688,009 | | 1960 | 3,476,403 |
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