Year | Value | 2022 | 13,767,807 | 2021 | 14,096,125 | 2020 | 14,312,732 | 2019 | 14,639,045 | 2018 | 15,009,594 | 2017 | 15,449,896 | 2016 | 15,981,902 | 2015 | 16,585,293 | 2014 | 17,228,682 | 2013 | 17,880,610 | 2012 | 18,509,631 | 2011 | 19,014,569 | 2010 | 19,299,876 | 2009 | 19,402,737 | 2008 | 19,428,569 | 2007 | 19,340,253 | 2006 | 19,125,490 | 2005 | 18,911,582 | 2004 | 18,703,389 | 2003 | 18,402,928 | 2002 | 18,087,224 | 2001 | 17,883,216 | 2000 | 17,721,775 | 1999 | 17,557,269 | 1998 | 17,398,952 | 1997 | 17,246,140 | 1996 | 17,066,408 | 1995 | 16,861,199 | 1994 | 16,688,790 | 1993 | 16,578,814 | 1992 | 16,472,476 | 1991 | 16,321,662 | 1990 | 16,220,686 | 1989 | 16,226,840 | 1988 | 16,341,288 | 1987 | 16,573,873 | 1986 | 16,957,669 | 1985 | 17,397,383 | 1984 | 17,759,367 | 1983 | 17,964,878 | 1982 | 18,032,092 | 1981 | 17,963,491 | 1980 | 17,765,263 | 1979 | 17,529,265 | 1978 | 17,258,629 | 1977 | 16,925,240 | 1976 | 16,630,840 | 1975 | 16,372,117 | 1974 | 16,115,576 | 1973 | 15,766,130 | 1972 | 15,311,804 | 1971 | 14,769,293 | 1970 | 13,809,650 | 1969 | 12,427,699 | 1968 | 11,101,819 | 1967 | 10,148,637 | 1966 | 9,783,998 | 1965 | 10,203,599 | 1964 | 11,220,953 | 1963 | 12,528,510 | 1962 | 13,782,025 | 1961 | 14,494,170 | 1960 | 14,611,378 |
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