Year | Value | 2022 | 32,290,871 | 2021 | 32,276,480 | 2020 | 32,092,387 | 2019 | 31,926,169 | 2018 | 31,809,714 | 2017 | 31,741,375 | 2016 | 31,737,941 | 2015 | 31,712,121 | 2014 | 31,654,109 | 2013 | 31,662,487 | 2012 | 31,681,386 | 2011 | 31,639,928 | 2010 | 31,696,758 | 2009 | 31,834,071 | 2008 | 32,024,726 | 2007 | 32,199,987 | 2006 | 32,454,820 | 2005 | 32,724,858 | 2004 | 32,852,125 | 2003 | 32,764,977 | 2002 | 32,578,161 | 2001 | 32,319,072 | 2000 | 31,957,911 | 1999 | 31,611,791 | 1998 | 31,277,550 | 1997 | 30,883,302 | 1996 | 30,460,473 | 1995 | 30,073,024 | 1994 | 29,759,215 | 1993 | 29,404,566 | 1992 | 28,948,359 | 1991 | 28,339,498 | 1990 | 27,116,710 | 1989 | 25,428,199 | 1988 | 23,825,306 | 1987 | 22,519,132 | 1986 | 21,858,932 | 1985 | 22,269,908 | 1984 | 23,431,616 | 1983 | 24,778,332 | 1982 | 26,079,617 | 1981 | 26,823,548 | 1980 | 26,864,670 | 1979 | 26,362,696 | 1978 | 25,495,748 | 1977 | 24,715,731 | 1976 | 24,231,304 | 1975 | 24,194,469 | 1974 | 24,601,982 | 1973 | 25,272,192 | 1972 | 25,855,794 | 1971 | 26,218,434 | 1970 | 26,384,260 | 1969 | 26,304,046 | 1968 | 26,011,398 | 1967 | 25,567,382 | 1966 | 24,982,688 | 1965 | 24,274,618 | 1964 | 23,261,306 | 1963 | 21,888,104 | 1962 | 20,320,971 | 1961 | 18,892,698 | 1960 | 18,008,440 |
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