Year | Value | 2022 | 33,694,791 | 2021 | 33,478,080 | 2020 | 33,209,815 | 2019 | 32,754,314 | 2018 | 32,637,182 | 2017 | 32,683,621 | 2016 | 32,329,584 | 2015 | 31,313,410 | 2014 | 30,136,601 | 2013 | 28,959,866 | 2012 | 27,685,705 | 2011 | 26,675,327 | 2010 | 26,472,468 | 2009 | 26,478,459 | 2008 | 26,256,569 | 2007 | 26,049,468 | 2006 | 25,863,956 | 2005 | 25,539,211 | 2004 | 25,128,094 | 2003 | 24,677,472 | 2002 | 24,242,102 | 2001 | 23,904,413 | 2000 | 23,720,791 | 1999 | 23,738,251 | 1998 | 23,883,872 | 1997 | 24,017,444 | 1996 | 24,116,030 | 1995 | 24,110,418 | 1994 | 23,969,058 | 1993 | 23,932,448 | 1992 | 23,908,339 | 1991 | 23,707,300 | 1990 | 23,500,308 | 1989 | 23,095,782 | 1988 | 22,062,261 | 1987 | 20,776,655 | 1986 | 19,662,039 | 1985 | 18,743,676 | 1984 | 18,456,319 | 1983 | 18,957,469 | 1982 | 19,812,151 | 1981 | 20,605,005 | 1980 | 21,110,033 | 1979 | 21,226,685 | 1978 | 21,055,870 | 1977 | 20,759,720 | 1976 | 20,344,019 | 1975 | 19,918,047 | 1974 | 19,472,908 | 1973 | 18,985,666 | 1972 | 18,567,108 | 1971 | 18,231,835 | 1970 | 17,898,752 | 1969 | 17,567,243 | 1968 | 17,236,939 | 1967 | 16,864,473 | 1966 | 16,473,018 | 1965 | 16,095,726 | 1964 | 15,737,882 | 1963 | 15,394,878 | 1962 | 15,006,358 | 1961 | 14,635,197 | 1960 | 14,280,814 |
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