Year | Value | 2022 | 30,982,588 | 2021 | 31,481,061 | 2020 | 31,651,328 | 2019 | 31,709,168 | 2018 | 31,913,265 | 2017 | 32,188,032 | 2016 | 32,562,261 | 2015 | 32,985,165 | 2014 | 33,379,688 | 2013 | 33,663,348 | 2012 | 33,794,531 | 2011 | 33,784,078 | 2010 | 33,785,868 | 2009 | 33,764,489 | 2008 | 33,766,883 | 2007 | 33,772,793 | 2006 | 33,855,598 | 2005 | 34,030,747 | 2004 | 34,208,943 | 2003 | 34,258,759 | 2002 | 34,185,731 | 2001 | 34,036,665 | 2000 | 33,905,445 | 1999 | 33,940,939 | 1998 | 34,203,964 | 1997 | 34,624,618 | 1996 | 35,206,426 | 1995 | 35,839,647 | 1994 | 36,360,983 | 1993 | 36,727,723 | 1992 | 36,974,905 | 1991 | 36,964,127 | 1990 | 36,907,104 | 1989 | 37,134,688 | 1988 | 37,461,041 | 1987 | 37,755,177 | 1986 | 38,087,094 | 1985 | 38,339,595 | 1984 | 38,291,232 | 1983 | 38,075,732 | 1982 | 37,796,288 | 1981 | 37,416,754 | 1980 | 36,961,694 | 1979 | 36,510,888 | 1978 | 36,026,382 | 1977 | 35,598,089 | 1976 | 35,402,646 | 1975 | 35,163,963 | 1974 | 34,803,923 | 1973 | 34,715,067 | 1972 | 34,840,226 | 1971 | 34,522,594 | 1970 | 33,469,286 | 1969 | 32,402,393 | 1968 | 31,329,911 | 1967 | 30,101,569 | 1966 | 29,117,566 | 1965 | 28,946,028 | 1964 | 29,043,816 | 1963 | 28,882,330 | 1962 | 28,699,776 | 1961 | 28,558,646 | 1960 | 28,292,812 |
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