| Year | Value | | 2022 | 17,998,220 | | 2021 | 17,452,283 | | 2020 | 16,910,989 | | 2019 | 16,370,553 | | 2018 | 15,828,040 | | 2017 | 15,293,335 | | 2016 | 14,764,575 | | 2015 | 14,248,799 | | 2014 | 13,746,371 | | 2013 | 13,252,938 | | 2012 | 12,770,743 | | 2011 | 12,303,450 | | 2010 | 11,853,530 | | 2009 | 11,422,969 | | 2008 | 11,013,001 | | 2007 | 10,620,174 | | 2006 | 10,244,381 | | 2005 | 9,886,765 | | 2004 | 9,545,020 | | 2003 | 9,219,638 | | 2002 | 8,912,191 | | 2001 | 8,619,083 | | 2000 | 8,339,311 | | 1999 | 8,071,413 | | 1998 | 7,813,123 | | 1997 | 7,561,436 | | 1996 | 7,315,200 | | 1995 | 7,077,381 | | 1994 | 6,845,622 | | 1993 | 6,621,767 | | 1992 | 6,408,303 | | 1991 | 6,199,060 | | 1990 | 5,991,207 | | 1989 | 5,787,505 | | 1988 | 5,588,733 | | 1987 | 5,396,035 | | 1986 | 5,206,761 | | 1985 | 5,018,620 | | 1984 | 4,834,820 | | 1983 | 4,656,894 | | 1982 | 4,485,276 | | 1981 | 4,321,167 | | 1980 | 4,164,145 | | 1979 | 4,014,347 | | 1978 | 3,872,130 | | 1977 | 3,735,823 | | 1976 | 3,606,782 | | 1975 | 3,483,416 | | 1974 | 3,362,438 | | 1973 | 3,244,749 | | 1972 | 3,132,441 | | 1971 | 3,032,948 | | 1970 | 2,953,347 | | 1969 | 2,902,120 | | 1968 | 2,879,001 | | 1967 | 2,867,926 | | 1966 | 2,856,740 | | 1965 | 2,838,939 | | 1964 | 2,812,590 | | 1963 | 2,779,473 | | 1962 | 2,742,689 | | 1961 | 2,704,394 | | 1960 | 2,670,229 |
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