| Year | Value | | 2022 | 15,431,910 | | 2021 | 14,984,191 | | 2020 | 14,581,508 | | 2019 | 14,186,065 | | 2018 | 13,787,612 | | 2017 | 13,388,956 | | 2016 | 12,987,874 | | 2015 | 12,592,201 | | 2014 | 12,200,024 | | 2013 | 11,804,349 | | 2012 | 11,406,885 | | 2011 | 11,006,920 | | 2010 | 10,602,677 | | 2009 | 10,183,421 | | 2008 | 9,763,076 | | 2007 | 9,384,172 | | 2006 | 9,048,489 | | 2005 | 8,738,936 | | 2004 | 8,472,567 | | 2003 | 8,241,823 | | 2002 | 7,996,712 | | 2001 | 7,742,749 | | 2000 | 7,519,145 | | 1999 | 7,316,956 | | 1998 | 7,128,282 | | 1997 | 6,968,042 | | 1996 | 6,823,254 | | 1995 | 6,678,873 | | 1994 | 6,549,748 | | 1993 | 6,426,922 | | 1992 | 6,291,598 | | 1991 | 6,167,498 | | 1990 | 6,063,726 | | 1989 | 5,960,182 | | 1988 | 5,856,277 | | 1987 | 5,754,207 | | 1986 | 5,648,677 | | 1985 | 5,539,893 | | 1984 | 5,425,366 | | 1983 | 5,308,193 | | 1982 | 5,195,102 | | 1981 | 5,094,722 | | 1980 | 5,010,104 | | 1979 | 4,922,924 | | 1978 | 4,823,710 | | 1977 | 4,726,380 | | 1976 | 4,634,391 | | 1975 | 4,539,536 | | 1974 | 4,438,447 | | 1973 | 4,334,211 | | 1972 | 4,231,630 | | 1971 | 4,139,304 | | 1970 | 4,051,289 | | 1969 | 3,956,789 | | 1968 | 3,861,078 | | 1967 | 3,767,897 | | 1966 | 3,679,806 | | 1965 | 3,596,734 | | 1964 | 3,517,227 | | 1963 | 3,442,816 | | 1962 | 3,372,310 | | 1961 | 3,301,265 | | 1960 | 3,228,862 |
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