Year | Value | 2022 | 39,131,315 | 2021 | 39,145,363 | 2020 | 39,086,232 | 2019 | 39,132,110 | 2018 | 39,340,204 | 2017 | 39,474,779 | 2016 | 39,680,640 | 2015 | 39,801,046 | 2014 | 39,599,471 | 2013 | 39,216,247 | 2012 | 38,805,588 | 2011 | 38,376,233 | 2010 | 37,947,258 | 2009 | 37,420,306 | 2008 | 36,864,071 | 2007 | 36,293,804 | 2006 | 35,940,654 | 2005 | 35,579,675 | 2004 | 35,159,637 | 2003 | 35,030,333 | 2002 | 35,096,018 | 2001 | 34,708,463 | 2000 | 33,633,761 | 1999 | 32,387,526 | 1998 | 31,148,623 | 1997 | 29,795,431 | 1996 | 28,714,375 | 1995 | 28,472,732 | 1994 | 28,532,945 | 1993 | 28,342,652 | 1992 | 28,142,454 | 1991 | 27,948,472 | 1990 | 27,626,637 | 1989 | 27,234,690 | 1988 | 26,774,983 | 1987 | 26,356,358 | 1986 | 26,087,735 | 1985 | 26,007,968 | 1984 | 26,154,416 | 1983 | 26,404,438 | 1982 | 26,616,259 | 1981 | 26,794,500 | 1980 | 26,853,293 | 1979 | 26,737,744 | 1978 | 26,749,888 | 1977 | 26,819,014 | 1976 | 26,668,470 | 1975 | 26,512,657 | 1974 | 26,128,953 | 1973 | 25,004,050 | 1972 | 23,523,035 | 1971 | 22,255,344 | 1970 | 21,205,565 | 1969 | 20,906,523 | 1968 | 21,476,769 | 1967 | 22,424,838 | 1966 | 23,298,793 | 1965 | 23,871,325 | 1964 | 24,015,567 | 1963 | 23,840,032 | 1962 | 23,528,493 | 1961 | 23,098,049 | 1960 | 22,633,891 |
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