| Year | Value | | 2022 | 24,137,552 | | 2021 | 23,574,042 | | 2020 | 23,037,823 | | 2019 | 22,377,036 | | 2018 | 21,723,657 | | 2017 | 21,082,454 | | 2016 | 20,413,210 | | 2015 | 19,744,968 | | 2014 | 19,142,803 | | 2013 | 18,532,355 | | 2012 | 17,940,034 | | 2011 | 17,311,007 | | 2010 | 16,614,024 | | 2009 | 15,824,123 | | 2008 | 15,056,027 | | 2007 | 14,338,807 | | 2006 | 13,630,966 | | 2005 | 13,004,843 | | 2004 | 12,465,088 | | 2003 | 11,912,582 | | 2002 | 11,397,585 | | 2001 | 10,920,025 | | 2000 | 10,436,108 | | 1999 | 10,097,955 | | 1998 | 9,985,797 | | 1997 | 9,984,848 | | 1996 | 9,974,749 | | 1995 | 9,899,799 | | 1994 | 9,708,617 | | 1993 | 9,435,732 | | 1992 | 9,129,921 | | 1991 | 8,806,939 | | 1990 | 8,495,559 | | 1989 | 8,191,817 | | 1988 | 7,894,015 | | 1987 | 7,597,353 | | 1986 | 7,324,341 | | 1985 | 7,082,079 | | 1984 | 6,844,381 | | 1983 | 6,627,948 | | 1982 | 6,389,402 | | 1981 | 6,147,484 | | 1980 | 5,945,970 | | 1979 | 5,758,909 | | 1978 | 5,584,884 | | 1977 | 5,422,492 | | 1976 | 5,284,711 | | 1975 | 5,170,852 | | 1974 | 5,068,796 | | 1973 | 4,987,580 | | 1972 | 4,912,508 | | 1971 | 4,826,730 | | 1970 | 4,735,451 | | 1969 | 4,644,649 | | 1968 | 4,546,411 | | 1967 | 4,443,252 | | 1966 | 4,340,277 | | 1965 | 4,243,791 | | 1964 | 4,130,968 | | 1963 | 4,029,612 | | 1962 | 3,953,365 | | 1961 | 3,858,019 | | 1960 | 3,755,791 |
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