Year | Value | 2022 | 35,259,296 | 2021 | 34,877,057 | 2020 | 34,440,896 | 2019 | 33,838,186 | 2018 | 33,264,697 | 2017 | 32,696,149 | 2016 | 32,334,770 | 2015 | 31,924,635 | 2014 | 31,490,729 | 2013 | 31,366,468 | 2012 | 31,407,334 | 2011 | 31,070,640 | 2010 | 30,185,674 | 2009 | 29,034,848 | 2008 | 27,852,026 | 2007 | 26,611,553 | 2006 | 25,568,588 | 2005 | 25,265,969 | 2004 | 25,273,380 | 2003 | 25,019,987 | 2002 | 24,763,400 | 2001 | 24,593,628 | 2000 | 24,305,138 | 1999 | 23,882,654 | 1998 | 23,498,009 | 1997 | 23,138,906 | 1996 | 22,850,805 | 1995 | 22,757,596 | 1994 | 22,897,361 | 1993 | 23,040,023 | 1992 | 23,071,204 | 1991 | 22,943,426 | 1990 | 22,527,426 | 1989 | 21,905,060 | 1988 | 21,365,868 | 1987 | 20,901,359 | 1986 | 20,390,550 | 1985 | 20,044,591 | 1984 | 19,664,681 | 1983 | 18,808,689 | 1982 | 17,745,505 | 1981 | 16,858,884 | 1980 | 16,104,632 | 1979 | 15,811,389 | 1978 | 16,167,783 | 1977 | 16,869,635 | 1976 | 17,540,966 | 1975 | 18,008,817 | 1974 | 18,196,919 | 1973 | 18,172,677 | 1972 | 18,060,276 | 1971 | 17,860,276 | 1970 | 17,617,940 | 1969 | 17,374,597 | 1968 | 17,037,469 | 1967 | 16,732,139 | 1966 | 16,472,094 | 1965 | 16,176,452 | 1964 | 15,851,639 | 1963 | 15,550,388 | 1962 | 15,172,645 | 1961 | 14,732,622 | 1960 | 14,323,499 |
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