Year | Value | 2022 | 29,975,610 | 2021 | 30,058,751 | 2020 | 30,043,801 | 2019 | 30,107,373 | 2018 | 30,189,415 | 2017 | 30,244,944 | 2016 | 30,362,424 | 2015 | 30,473,608 | 2014 | 30,444,144 | 2013 | 30,226,028 | 2012 | 29,950,711 | 2011 | 29,610,633 | 2010 | 29,181,800 | 2009 | 28,711,577 | 2008 | 28,300,173 | 2007 | 27,857,108 | 2006 | 27,424,390 | 2005 | 27,088,089 | 2004 | 26,839,890 | 2003 | 26,572,141 | 2002 | 26,245,217 | 2001 | 25,796,047 | 2000 | 24,797,006 | 1999 | 23,350,643 | 1998 | 21,969,434 | 1997 | 20,800,530 | 1996 | 20,149,907 | 1995 | 20,456,806 | 1994 | 21,416,890 | 1993 | 22,489,897 | 1992 | 23,523,773 | 1991 | 24,093,692 | 1990 | 24,067,567 | 1989 | 23,633,123 | 1988 | 22,906,295 | 1987 | 22,243,440 | 1986 | 21,870,462 | 1985 | 21,861,957 | 1984 | 22,181,916 | 1983 | 22,715,768 | 1982 | 23,137,168 | 1981 | 23,204,457 | 1980 | 22,867,091 | 1979 | 22,187,455 | 1978 | 21,303,438 | 1977 | 20,333,506 | 1976 | 19,456,566 | 1975 | 18,713,659 | 1974 | 17,878,895 | 1973 | 16,787,329 | 1972 | 15,574,977 | 1971 | 14,443,836 | 1970 | 13,670,124 | 1969 | 13,677,030 | 1968 | 14,412,501 | 1967 | 15,500,113 | 1966 | 16,610,972 | 1965 | 17,435,792 | 1964 | 17,810,099 | 1963 | 17,846,303 | 1962 | 17,761,416 | 1961 | 17,654,101 | 1960 | 17,486,634 |
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