| Year | Value | | 2022 | 23,042,076 | | 2021 | 22,290,007 | | 2020 | 21,527,868 | | 2019 | 20,762,526 | | 2018 | 20,015,074 | | 2017 | 19,295,197 | | 2016 | 18,603,008 | | 2015 | 17,934,313 | | 2014 | 17,282,880 | | 2013 | 16,641,475 | | 2012 | 16,014,785 | | 2011 | 15,410,402 | | 2010 | 14,845,551 | | 2009 | 14,317,721 | | 2008 | 13,809,153 | | 2007 | 13,354,448 | | 2006 | 12,934,368 | | 2005 | 12,494,896 | | 2004 | 12,064,384 | | 2003 | 11,657,299 | | 2002 | 11,259,671 | | 2001 | 10,908,186 | | 2000 | 10,617,461 | | 1999 | 10,349,617 | | 1998 | 10,095,004 | | 1997 | 9,858,927 | | 1996 | 9,631,533 | | 1995 | 9,385,063 | | 1994 | 9,063,610 | | 1993 | 8,732,477 | | 1992 | 8,476,456 | | 1991 | 8,285,253 | | 1990 | 8,145,451 | | 1989 | 8,023,218 | | 1988 | 7,905,157 | | 1987 | 7,754,880 | | 1986 | 7,562,790 | | 1985 | 7,364,033 | | 1984 | 7,169,394 | | 1983 | 6,991,759 | | 1982 | 6,834,888 | | 1981 | 6,710,092 | | 1980 | 6,597,058 | | 1979 | 6,456,441 | | 1978 | 6,299,086 | | 1977 | 6,149,044 | | 1976 | 6,017,520 | | 1975 | 5,892,998 | | 1974 | 5,769,436 | | 1973 | 5,649,048 | | 1972 | 5,535,153 | | 1971 | 5,426,061 | | 1970 | 5,317,048 | | 1969 | 5,212,196 | | 1968 | 5,112,592 | | 1967 | 5,016,447 | | 1966 | 4,923,402 | | 1965 | 4,831,668 | | 1964 | 4,741,399 | | 1963 | 4,651,930 | | 1962 | 4,562,411 | | 1961 | 4,472,813 | | 1960 | 4,383,044 |
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