| Year | Value | | 2022 | 21,780,401 | | 2021 | 21,022,639 | | 2020 | 20,287,928 | | 2019 | 19,571,248 | | 2018 | 18,868,776 | | 2017 | 18,183,772 | | 2016 | 17,513,591 | | 2015 | 16,857,908 | | 2014 | 16,230,067 | | 2013 | 15,629,889 | | 2012 | 15,043,639 | | 2011 | 14,480,483 | | 2010 | 13,947,145 | | 2009 | 13,435,763 | | 2008 | 12,946,955 | | 2007 | 12,479,352 | | 2006 | 12,032,552 | | 2005 | 11,604,856 | | 2004 | 11,195,167 | | 2003 | 10,804,283 | | 2002 | 10,431,710 | | 2001 | 10,075,119 | | 2000 | 9,741,420 | | 1999 | 9,422,866 | | 1998 | 9,115,962 | | 1997 | 8,821,740 | | 1996 | 8,540,664 | | 1995 | 8,265,969 | | 1994 | 8,003,727 | | 1993 | 7,758,039 | | 1992 | 7,524,376 | | 1991 | 7,300,674 | | 1990 | 7,084,247 | | 1989 | 6,875,208 | | 1988 | 6,674,961 | | 1987 | 6,491,637 | | 1986 | 6,314,667 | | 1985 | 6,142,826 | | 1984 | 5,975,752 | | 1983 | 5,813,191 | | 1982 | 5,653,891 | | 1981 | 5,496,885 | | 1980 | 5,343,317 | | 1979 | 5,194,871 | | 1978 | 5,053,553 | | 1977 | 4,930,761 | | 1976 | 4,828,866 | | 1975 | 4,729,780 | | 1974 | 4,633,010 | | 1973 | 4,538,468 | | 1972 | 4,444,918 | | 1971 | 4,352,332 | | 1970 | 4,259,054 | | 1969 | 4,164,153 | | 1968 | 4,068,671 | | 1967 | 3,972,512 | | 1966 | 3,876,253 | | 1965 | 3,777,520 | | 1964 | 3,679,961 | | 1963 | 3,583,434 | | 1962 | 3,488,404 | | 1961 | 3,390,125 | | 1960 | 3,294,825 |
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