| Year | Value | | 2022 | 20,036,039 | | 2021 | 18,237,084 | | 2020 | 18,374,332 | | 2019 | 19,602,815 | | 2018 | 20,081,015 | | 2017 | 19,826,224 | | 2016 | 19,905,093 | | 2015 | 17,942,560 | | 2014 | 16,819,024 | | 2013 | 16,063,547 | | 2012 | 13,775,252 | | 2011 | 11,727,401 | | 2010 | 10,926,019 | | 2009 | 10,671,878 | | 2008 | 9,357,735 | | 2007 | 7,731,508 | | 2006 | 5,519,293 | | 2005 | 4,534,143 | | 2004 | 3,683,117 | | 2003 | 2,972,331 | | 2002 | 2,428,071 | | 2001 | 1,909,303 | | 2000 | 1,428,115 | | 1999 | 832,267 | | 1998 | 493,278 | | 1997 | 309,373 | | 1996 | 193,834 | | 1995 | 128,968 | | 1994 | 91,488 | | 1993 | 70,586 | | 1992 | 48,919 | | 1991 | 43,008 | | 1990 | 33,578 | | 1989 | 24,946 | | 1988 | 13,823 | | 1987 | 13,711 | | 1986 | 11,191 | | 1985 | 7,924 | | 1984 | 4,936 | | 1983 | 3,564 | | 1982 | 2,330 |
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