| Year | Value | | 2022 | 20,405,317 | | 2021 | 19,889,742 | | 2020 | 19,377,061 | | 2019 | 18,867,337 | | 2018 | 18,367,883 | | 2017 | 17,881,167 | | 2016 | 17,405,624 | | 2015 | 16,938,942 | | 2014 | 16,477,966 | | 2013 | 16,024,775 | | 2012 | 15,581,251 | | 2011 | 15,146,094 | | 2010 | 14,718,422 | | 2009 | 14,298,932 | | 2008 | 13,889,423 | | 2007 | 13,495,463 | | 2006 | 13,118,307 | | 2005 | 12,755,648 | | 2004 | 12,411,342 | | 2003 | 12,087,965 | | 2002 | 11,784,498 | | 2001 | 11,498,818 | | 2000 | 11,229,387 | | 1999 | 10,973,956 | | 1998 | 10,732,456 | | 1997 | 10,512,678 | | 1996 | 10,310,528 | | 1995 | 10,112,816 | | 1994 | 10,131,799 | | 1993 | 10,257,233 | | 1992 | 10,115,420 | | 1991 | 9,831,584 | | 1990 | 9,539,665 | | 1989 | 9,174,895 | | 1988 | 8,754,781 | | 1987 | 8,295,993 | | 1986 | 7,909,819 | | 1985 | 7,625,078 | | 1984 | 7,339,002 | | 1983 | 7,058,317 | | 1982 | 6,784,347 | | 1981 | 6,519,891 | | 1980 | 6,267,369 | | 1979 | 6,029,140 | | 1978 | 5,808,810 | | 1977 | 5,611,712 | | 1976 | 5,438,226 | | 1975 | 5,280,965 | | 1974 | 5,134,199 | | 1973 | 4,996,239 | | 1972 | 4,865,978 | | 1971 | 4,742,480 | | 1970 | 4,625,141 | | 1969 | 4,512,861 | | 1968 | 4,403,430 | | 1967 | 4,295,762 | | 1966 | 4,190,764 | | 1965 | 4,089,097 | | 1964 | 3,990,361 | | 1963 | 3,893,628 | | 1962 | 3,799,155 | | 1961 | 3,708,193 | | 1960 | 3,621,081 |
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