Year | Value | 2023 | 25,908,514 | 2022 | 25,876,625 | 2021 | 25,914,846 | 2020 | 25,938,911 | 2019 | 25,889,856 | 2018 | 25,783,018 | 2017 | 25,654,936 | 2016 | 25,566,204 | 2015 | 25,466,609 | 2014 | 25,356,139 | 2013 | 25,224,087 | 2012 | 25,137,200 | 2011 | 25,034,107 | 2010 | 24,852,253 | 2009 | 24,715,248 | 2008 | 24,570,971 | 2007 | 24,368,149 | 2006 | 24,228,799 | 2005 | 24,081,655 | 2004 | 24,005,609 | 2003 | 23,885,395 | 2002 | 23,737,995 | 2001 | 23,577,705 | 2000 | 23,385,302 | 1999 | 23,190,296 | 1998 | 23,026,003 | 1997 | 22,859,276 | 1996 | 22,645,433 | 1995 | 22,432,247 | 1994 | 22,210,858 | 1993 | 21,992,707 | 1992 | 21,773,212 | 1991 | 21,548,966 | 1990 | 21,346,470 | 1989 | 21,154,831 | 1988 | 20,962,445 | 1987 | 20,772,477 | 1986 | 20,582,576 | 1985 | 20,385,468 | 1984 | 20,182,770 | 1983 | 19,929,832 | 1982 | 19,631,317 | 1981 | 19,322,543 | 1980 | 19,011,317 | 1979 | 18,701,467 | 1978 | 18,404,430 | 1977 | 18,112,175 | 1976 | 17,817,685 | 1975 | 17,526,507 | 1974 | 17,235,516 |
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