| Year | Value | | 2022 | 16,854,089 | | 2021 | 16,250,768 | | 2020 | 15,666,605 | | 2019 | 15,103,564 | | 2018 | 14,549,314 | | 2017 | 13,981,657 | | 2016 | 13,435,884 | | 2015 | 12,937,739 | | 2014 | 12,466,023 | | 2013 | 12,059,405 | | 2012 | 11,724,384 | | 2011 | 11,429,725 | | 2010 | 11,164,206 | | 2009 | 10,870,585 | | 2008 | 10,555,557 | | 2007 | 10,251,288 | | 2006 | 9,953,157 | | 2005 | 9,677,493 | | 2004 | 9,429,935 | | 2003 | 9,204,829 | | 2002 | 8,988,199 | | 2001 | 8,770,792 | | 2000 | 8,545,786 | | 1999 | 8,316,235 | | 1998 | 8,106,940 | | 1997 | 7,907,810 | | 1996 | 7,703,691 | | 1995 | 7,507,027 | | 1994 | 7,305,801 | | 1993 | 7,120,388 | | 1992 | 6,774,252 | | 1991 | 6,401,787 | | 1990 | 6,034,102 | | 1989 | 5,678,998 | | 1988 | 5,367,900 | | 1987 | 5,079,280 | | 1986 | 4,773,983 | | 1985 | 4,476,659 | | 1984 | 4,197,893 | | 1983 | 3,915,592 | | 1982 | 3,693,890 | | 1981 | 3,509,758 | | 1980 | 3,327,881 | | 1979 | 3,154,994 | | 1978 | 2,991,826 | | 1977 | 2,837,227 | | 1976 | 2,692,656 | | 1975 | 2,556,840 | | 1974 | 2,427,528 | | 1973 | 2,312,860 | | 1972 | 2,163,193 | | 1971 | 2,009,388 | | 1970 | 1,867,959 | | 1969 | 1,737,915 | | 1968 | 1,616,793 | | 1967 | 1,503,387 | | 1966 | 1,397,925 | | 1965 | 1,298,891 | | 1964 | 1,204,810 | | 1963 | 1,117,692 | | 1962 | 1,037,708 | | 1961 | 963,424 | | 1960 | 894,762 |
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