Year | Value | 2022 | 37,665,822 | 2021 | 37,256,331 | 2020 | 36,809,619 | 2019 | 36,153,645 | 2018 | 35,796,464 | 2017 | 35,658,448 | 2016 | 35,179,168 | 2015 | 34,046,165 | 2014 | 32,784,249 | 2013 | 31,516,210 | 2012 | 30,108,339 | 2011 | 28,910,350 | 2010 | 28,476,304 | 2009 | 28,232,385 | 2008 | 27,732,222 | 2007 | 27,250,280 | 2006 | 26,889,745 | 2005 | 26,493,263 | 2004 | 26,093,989 | 2003 | 25,734,095 | 2002 | 25,405,558 | 2001 | 25,120,597 | 2000 | 24,884,560 | 1999 | 24,776,529 | 1998 | 24,729,610 | 1997 | 24,675,146 | 1996 | 24,619,145 | 1995 | 24,509,710 | 1994 | 24,296,768 | 1993 | 24,217,426 | 1992 | 24,188,836 | 1991 | 23,996,310 | 1990 | 23,814,941 | 1989 | 23,450,487 | 1988 | 22,433,593 | 1987 | 21,152,569 | 1986 | 20,053,581 | 1985 | 19,107,117 | 1984 | 18,739,614 | 1983 | 19,168,047 | 1982 | 19,923,600 | 1981 | 20,579,835 | 1980 | 20,992,417 | 1979 | 21,083,096 | 1978 | 20,919,388 | 1977 | 20,645,335 | 1976 | 20,270,522 | 1975 | 19,865,781 | 1974 | 19,430,938 | 1973 | 18,950,438 | 1972 | 18,534,094 | 1971 | 18,206,539 | 1970 | 17,878,126 | 1969 | 17,563,437 | 1968 | 17,272,112 | 1967 | 16,941,809 | 1966 | 16,565,061 | 1965 | 16,214,496 | 1964 | 15,876,101 | 1963 | 15,516,703 | 1962 | 15,099,373 | 1961 | 14,696,028 | 1960 | 14,319,734 |
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