| Year | Value | | 2022 | 15,151,745 | | 2021 | 14,901,117 | | 2020 | 14,632,098 | | 2019 | 14,304,721 | | 2018 | 13,932,427 | | 2017 | 13,546,898 | | 2016 | 13,157,433 | | 2015 | 12,761,521 | | 2014 | 12,358,702 | | 2013 | 11,955,551 | | 2012 | 11,557,488 | | 2011 | 11,169,564 | | 2010 | 10,797,343 | | 2009 | 10,442,135 | | 2008 | 10,068,806 | | 2007 | 9,686,178 | | 2006 | 9,302,874 | | 2005 | 8,926,859 | | 2004 | 8,573,220 | | 2003 | 8,258,339 | | 2002 | 7,984,710 | | 2001 | 7,744,284 | | 2000 | 7,525,520 | | 1999 | 7,318,650 | | 1998 | 7,123,576 | | 1997 | 6,934,452 | | 1996 | 6,748,712 | | 1995 | 6,563,544 | | 1994 | 6,379,280 | | 1993 | 6,205,459 | | 1992 | 6,047,687 | | 1991 | 5,902,980 | | 1990 | 5,772,992 | | 1989 | 5,657,956 | | 1988 | 5,549,226 | | 1987 | 5,440,377 | | 1986 | 5,329,217 | | 1985 | 5,213,810 | | 1984 | 5,092,987 | | 1983 | 4,964,352 | | 1982 | 4,827,949 | | 1981 | 4,687,810 | | 1980 | 4,545,793 | | 1979 | 4,400,451 | | 1978 | 4,253,777 | | 1977 | 4,113,779 | | 1976 | 3,987,753 | | 1975 | 3,879,339 | | 1974 | 3,788,099 | | 1973 | 3,712,421 | | 1972 | 3,648,085 | | 1971 | 3,585,878 | | 1970 | 3,520,666 | | 1969 | 3,450,275 | | 1968 | 3,372,176 | | 1967 | 3,287,760 | | 1966 | 3,201,188 | | 1965 | 3,115,604 | | 1964 | 3,032,330 | | 1963 | 2,953,266 | | 1962 | 2,878,364 | | 1961 | 2,805,230 | | 1960 | 2,732,055 |
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