Year | Value | 2022 | 15,670,772 | 2021 | 16,346,585 | 2020 | 16,562,049 | 2019 | 16,645,468 | 2018 | 16,620,386 | 2017 | 16,451,046 | 2016 | 16,115,466 | 2015 | 15,778,875 | 2014 | 15,471,238 | 2013 | 15,133,265 | 2012 | 14,836,778 | 2011 | 14,650,026 | 2010 | 14,467,206 | 2009 | 14,276,374 | 2008 | 14,110,144 | 2007 | 13,963,282 | 2006 | 13,826,707 | 2005 | 13,641,910 | 2004 | 13,435,485 | 2003 | 13,275,315 | 2002 | 13,109,614 | 2001 | 12,940,982 | 2000 | 12,891,072 | 1999 | 12,982,487 | 1998 | 13,198,481 | 1997 | 13,504,458 | 1996 | 13,884,526 | 1995 | 14,269,188 | 1994 | 14,597,074 | 1993 | 14,762,466 | 1992 | 14,796,356 | 1991 | 14,703,190 | 1990 | 14,496,698 | 1989 | 14,319,777 | 1988 | 14,131,290 | 1987 | 13,857,492 | 1986 | 13,557,494 | 1985 | 13,259,246 | 1984 | 12,972,346 | 1983 | 12,610,409 | 1982 | 12,187,949 | 1981 | 11,736,276 | 1980 | 10,965,778 | 1979 | 9,856,276 | 1978 | 8,775,593 | 1977 | 7,991,225 | 1976 | 7,762,669 | 1975 | 8,239,211 | 1974 | 9,260,338 | 1973 | 10,545,298 | 1972 | 11,750,324 | 1971 | 12,388,710 | 1970 | 12,424,033 | 1969 | 12,011,743 | 1968 | 11,270,860 | 1967 | 10,600,142 | 1966 | 10,187,174 | 1965 | 10,165,014 | 1964 | 10,491,388 | 1963 | 11,072,333 | 1962 | 11,552,435 | 1961 | 11,846,839 | 1960 | 11,940,440 |
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