Year | Value | 2022 | 16,591,320 | 2021 | 16,567,879 | 2020 | 16,324,362 | 2019 | 16,071,117 | 2018 | 15,821,224 | 2017 | 15,600,258 | 2016 | 15,383,435 | 2015 | 15,165,200 | 2014 | 14,946,599 | 2013 | 14,788,277 | 2012 | 14,640,632 | 2011 | 14,435,107 | 2010 | 14,262,829 | 2009 | 14,210,163 | 2008 | 14,270,158 | 2007 | 14,452,235 | 2006 | 14,821,334 | 2005 | 15,274,905 | 2004 | 15,669,151 | 2003 | 15,891,740 | 2002 | 15,988,643 | 2001 | 15,974,155 | 2000 | 15,813,422 | 1999 | 15,645,391 | 1998 | 15,500,517 | 1997 | 15,280,242 | 1996 | 15,034,210 | 1995 | 14,820,419 | 1994 | 14,629,927 | 1993 | 14,336,958 | 1992 | 13,922,309 | 1991 | 13,407,638 | 1990 | 12,514,206 | 1989 | 11,279,300 | 1988 | 10,081,570 | 1987 | 9,203,076 | 1986 | 8,873,978 | 1985 | 9,257,346 | 1984 | 10,191,544 | 1983 | 11,377,411 | 1982 | 12,541,229 | 1981 | 13,205,051 | 1980 | 13,318,089 | 1979 | 13,035,615 | 1978 | 12,433,395 | 1977 | 11,825,994 | 1976 | 11,435,314 | 1975 | 11,391,544 | 1974 | 11,703,375 | 1973 | 12,194,224 | 1972 | 12,559,689 | 1971 | 12,634,629 | 1970 | 12,355,797 | 1969 | 11,752,544 | 1968 | 10,926,607 | 1967 | 9,940,234 | 1966 | 8,955,633 | 1965 | 8,108,469 | 1964 | 7,389,728 | 1963 | 6,828,986 | 1962 | 6,362,709 | 1961 | 5,987,662 | 1960 | 5,810,937 |
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