Year | Value | 2022 | 15,993,291 | 2021 | 15,510,441 | 2020 | 15,691,469 | 2019 | 16,330,873 | 2018 | 17,037,256 | 2017 | 17,728,710 | 2016 | 18,086,124 | 2015 | 17,975,895 | 2014 | 17,531,325 | 2013 | 16,868,606 | 2012 | 16,231,984 | 2011 | 15,810,106 | 2010 | 15,704,690 | 2009 | 15,811,755 | 2008 | 16,091,146 | 2007 | 16,324,241 | 2006 | 16,410,822 | 2005 | 16,359,662 | 2004 | 16,192,420 | 2003 | 15,971,804 | 2002 | 15,693,563 | 2001 | 15,373,422 | 2000 | 14,975,718 | 1999 | 14,377,503 | 1998 | 13,497,737 | 1997 | 12,477,381 | 1996 | 11,512,229 | 1995 | 10,837,255 | 1994 | 10,790,260 | 1993 | 11,353,640 | 1992 | 12,237,399 | 1991 | 13,137,570 | 1990 | 13,740,664 | 1989 | 13,891,430 | 1988 | 13,749,061 | 1987 | 13,511,048 | 1986 | 13,241,913 | 1985 | 12,996,067 | 1984 | 12,712,992 | 1983 | 12,443,038 | 1982 | 12,192,199 | 1981 | 11,943,642 | 1980 | 11,697,251 | 1979 | 11,399,686 | 1978 | 10,998,180 | 1977 | 10,557,248 | 1976 | 10,144,649 | 1975 | 9,749,032 | 1974 | 9,396,836 | 1973 | 9,123,693 | 1972 | 8,860,873 | 1971 | 8,559,245 | 1970 | 8,296,816 | 1969 | 8,105,935 | 1968 | 7,964,463 | 1967 | 7,836,724 | 1966 | 7,692,462 | 1965 | 7,547,916 | 1964 | 7,387,973 | 1963 | 7,143,696 | 1962 | 6,906,414 | 1961 | 6,711,583 | 1960 | 6,493,664 |
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