| Year | Value | | 2022 | 17,381,835 | | 2021 | 17,156,859 | | 2020 | 17,014,433 | | 2019 | 16,855,112 | | 2018 | 16,612,567 | | 2017 | 16,326,174 | | 2016 | 15,972,387 | | 2015 | 15,558,788 | | 2014 | 15,121,772 | | 2013 | 14,716,734 | | 2012 | 14,370,208 | | 2011 | 14,067,906 | | 2010 | 13,795,625 | | 2009 | 13,490,518 | | 2008 | 13,102,699 | | 2007 | 12,665,755 | | 2006 | 12,228,094 | | 2005 | 11,851,205 | | 2004 | 11,579,536 | | 2003 | 11,362,755 | | 2002 | 11,156,149 | | 2001 | 10,951,975 | | 2000 | 10,747,793 | | 1999 | 10,540,140 | | 1998 | 10,334,982 | | 1997 | 10,140,886 | | 1996 | 9,954,061 | | 1995 | 9,776,100 | | 1994 | 9,612,805 | | 1993 | 9,442,031 | | 1992 | 9,286,794 | | 1991 | 9,122,431 | | 1990 | 8,903,987 | | 1989 | 8,669,180 | | 1988 | 8,440,714 | | 1987 | 8,234,785 | | 1986 | 8,034,163 | | 1985 | 7,835,552 | | 1984 | 7,641,899 | | 1983 | 7,457,879 | | 1982 | 7,278,296 | | 1981 | 7,104,280 | | 1980 | 6,933,141 | | 1979 | 6,758,816 | | 1978 | 6,583,077 | | 1977 | 6,403,372 | | 1976 | 6,223,630 | | 1975 | 6,051,410 | | 1974 | 5,890,568 | | 1973 | 5,743,282 | | 1972 | 5,603,239 | | 1971 | 5,473,464 | | 1970 | 5,354,264 | | 1969 | 5,245,464 | | 1968 | 5,141,129 | | 1967 | 5,036,777 | | 1966 | 4,941,706 | | 1965 | 4,854,584 | | 1964 | 4,766,423 | | 1963 | 4,671,839 | | 1962 | 4,573,193 | | 1961 | 4,476,165 | | 1960 | 4,392,617 |
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