Year | Value | 2022 | 32,217,548 | 2021 | 31,642,545 | 2020 | 31,015,110 | 2019 | 30,286,358 | 2018 | 29,515,693 | 2017 | 28,705,179 | 2016 | 27,854,874 | 2015 | 26,969,813 | 2014 | 26,045,873 | 2013 | 24,940,077 | 2012 | 23,692,145 | 2011 | 22,491,052 | 2010 | 21,353,698 | 2009 | 20,289,802 | 2008 | 19,485,186 | 2007 | 18,930,552 | 2006 | 18,419,547 | 2005 | 17,948,399 | 2004 | 17,533,166 | 2003 | 17,171,931 | 2002 | 16,848,749 | 2001 | 16,537,747 | 2000 | 16,217,697 | 1999 | 15,879,671 | 1998 | 15,522,659 | 1997 | 15,158,886 | 1996 | 14,813,650 | 1995 | 14,498,948 | 1994 | 14,201,949 | 1993 | 13,910,818 | 1992 | 13,625,368 | 1991 | 13,343,765 | 1990 | 13,062,457 | 1989 | 12,777,138 | 1988 | 12,485,541 | 1987 | 12,193,056 | 1986 | 11,909,504 | 1985 | 11,640,680 | 1984 | 11,386,245 | 1983 | 11,147,326 | 1982 | 10,921,779 | 1981 | 10,704,389 | 1980 | 10,484,488 | 1979 | 10,255,277 | 1978 | 10,017,504 | 1977 | 9,775,897 | 1976 | 9,544,063 | 1975 | 9,330,094 | 1974 | 9,136,397 | 1973 | 8,967,388 | 1972 | 8,814,503 | 1971 | 8,675,944 | 1970 | 8,514,817 | 1969 | 8,307,344 | 1968 | 8,069,154 | 1967 | 7,815,233 | 1966 | 7,580,172 | 1965 | 7,381,543 | 1964 | 7,213,240 | 1963 | 7,080,288 | 1962 | 6,973,715 | 1961 | 6,848,053 | 1960 | 6,673,499 |
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