Year | Value | 2022 | 13,145,169 | 2021 | 13,480,892 | 2020 | 13,709,348 | 2019 | 14,042,844 | 2018 | 14,417,522 | 2017 | 14,862,802 | 2016 | 15,388,185 | 2015 | 15,976,740 | 2014 | 16,609,965 | 2013 | 17,264,062 | 2012 | 17,901,824 | 2011 | 18,430,971 | 2010 | 18,758,536 | 2009 | 18,922,170 | 2008 | 18,995,857 | 2007 | 18,923,234 | 2006 | 18,717,231 | 2005 | 18,501,325 | 2004 | 18,289,414 | 2003 | 18,001,887 | 2002 | 17,721,538 | 2001 | 17,546,227 | 2000 | 17,397,213 | 1999 | 17,246,507 | 1998 | 17,095,556 | 1997 | 16,933,621 | 1996 | 16,729,110 | 1995 | 16,463,615 | 1994 | 16,189,326 | 1993 | 15,992,993 | 1992 | 15,849,216 | 1991 | 15,696,178 | 1990 | 15,619,186 | 1989 | 15,683,362 | 1988 | 15,838,023 | 1987 | 16,050,894 | 1986 | 16,383,827 | 1985 | 16,762,561 | 1984 | 17,056,669 | 1983 | 17,212,363 | 1982 | 17,272,611 | 1981 | 17,248,811 | 1980 | 17,159,933 | 1979 | 17,072,676 | 1978 | 16,952,838 | 1977 | 16,716,035 | 1976 | 16,419,158 | 1975 | 16,115,412 | 1974 | 15,820,418 | 1973 | 15,437,016 | 1972 | 14,967,061 | 1971 | 14,436,153 | 1970 | 13,489,909 | 1969 | 12,150,908 | 1968 | 10,872,714 | 1967 | 9,948,643 | 1966 | 9,635,845 | 1965 | 10,112,514 | 1964 | 11,182,591 | 1963 | 12,546,774 | 1962 | 13,833,176 | 1961 | 14,551,356 | 1960 | 14,655,342 |
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