| Year | Value | | 2023 | 15,191,227 | | 2022 | 14,692,946 | | 2021 | 14,105,884 | | 2020 | 13,664,108 | | 2019 | 13,352,327 | | 2018 | 12,938,717 | | 2017 | 12,527,179 | | 2016 | 12,098,571 | | 2015 | 11,678,215 | | 2014 | 11,326,670 | | 2013 | 10,991,654 | | 2012 | 10,678,295 | | 2011 | 10,392,301 | | 2010 | 10,136,050 | | 2009 | 9,909,785 | | 2008 | 9,704,963 | | 2007 | 9,503,272 | | 2006 | 9,304,311 | | 2005 | 9,114,106 | | 2004 | 8,925,284 | | 2003 | 8,739,807 | | 2002 | 8,560,707 | | 2001 | 8,387,083 | | 2000 | 8,224,438 | | 1999 | 8,072,463 | | 1998 | 7,925,921 | | 1997 | 7,782,804 | | 1996 | 7,584,085 | | 1995 | 7,349,569 | | 1994 | 7,028,543 | | 1993 | 6,694,848 | | 1992 | 6,507,958 | | 1991 | 6,381,313 |
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