| Year | Value | | 2022 | 17,203,710 | | 2021 | 16,939,079 | | 2020 | 16,703,261 | | 2019 | 16,463,032 | | 2018 | 16,208,509 | | 2017 | 15,936,515 | | 2016 | 15,639,972 | | 2015 | 15,312,527 | | 2014 | 14,952,809 | | 2013 | 14,569,397 | | 2012 | 14,171,778 | | 2011 | 13,764,217 | | 2010 | 13,355,013 | | 2009 | 12,956,634 | | 2008 | 12,550,213 | | 2007 | 12,148,742 | | 2006 | 11,756,199 | | 2005 | 11,374,407 | | 2004 | 10,999,163 | | 2003 | 10,613,401 | | 2002 | 10,215,287 | | 2001 | 9,814,520 | | 2000 | 9,421,260 | | 1999 | 9,050,457 | | 1998 | 8,718,951 | | 1997 | 8,430,982 | | 1996 | 8,179,090 | | 1995 | 7,951,890 | | 1994 | 7,737,672 | | 1993 | 7,535,337 | | 1992 | 7,340,679 | | 1991 | 7,149,940 | | 1990 | 6,959,188 | | 1989 | 6,773,940 | | 1988 | 6,603,452 | | 1987 | 6,447,906 | | 1986 | 6,305,522 | | 1985 | 6,177,411 | | 1984 | 6,061,273 | | 1983 | 5,950,046 | | 1982 | 5,839,713 | | 1981 | 5,726,670 | | 1980 | 5,605,459 | | 1979 | 5,474,984 | | 1978 | 5,336,410 | | 1977 | 5,190,056 | | 1976 | 5,038,984 | | 1975 | 4,885,866 | | 1974 | 4,730,424 | | 1973 | 4,574,472 | | 1972 | 4,426,312 | | 1971 | 4,294,747 | | 1970 | 4,186,882 | | 1969 | 4,100,094 | | 1968 | 4,027,919 | | 1967 | 3,965,903 | | 1966 | 3,904,628 | | 1965 | 3,836,565 | | 1964 | 3,760,311 | | 1963 | 3,676,461 | | 1962 | 3,586,332 | | 1961 | 3,494,019 | | 1960 | 3,402,971 |
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