Year | Value | 2022 | 31,486,353 | 2021 | 31,637,399 | 2020 | 31,612,986 | 2019 | 31,555,062 | 2018 | 31,567,054 | 2017 | 31,581,703 | 2016 | 31,526,571 | 2015 | 31,511,091 | 2014 | 31,621,796 | 2013 | 31,779,406 | 2012 | 31,930,775 | 2011 | 32,160,928 | 2010 | 32,455,230 | 2009 | 32,558,574 | 2008 | 32,469,700 | 2007 | 32,300,230 | 2006 | 32,062,153 | 2005 | 31,686,913 | 2004 | 31,301,046 | 2003 | 30,913,721 | 2002 | 30,471,750 | 2001 | 30,033,963 | 2000 | 29,656,779 | 1999 | 29,353,532 | 1998 | 29,009,642 | 1997 | 28,572,602 | 1996 | 27,984,070 | 1995 | 26,802,165 | 1994 | 25,134,650 | 1993 | 23,557,352 | 1992 | 22,273,941 | 1991 | 21,621,874 | 1990 | 22,010,677 | 1989 | 23,132,373 | 1988 | 24,427,705 | 1987 | 25,670,349 | 1986 | 26,377,912 | 1985 | 26,415,409 | 1984 | 25,929,427 | 1983 | 25,091,732 | 1982 | 24,347,627 | 1981 | 23,896,888 | 1980 | 23,868,560 | 1979 | 24,250,767 | 1978 | 24,908,356 | 1977 | 25,490,555 | 1976 | 25,846,917 | 1975 | 25,978,381 | 1974 | 25,876,633 | 1973 | 25,641,191 | 1972 | 25,273,067 | 1971 | 24,765,417 | 1970 | 24,009,549 | 1969 | 22,921,063 | 1968 | 21,554,999 | 1967 | 19,995,527 | 1966 | 18,563,841 | 1965 | 17,683,543 | 1964 | 17,826,002 | 1963 | 18,823,482 | 1962 | 20,242,729 | 1961 | 21,675,648 | 1960 | 22,691,023 |
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