| Year | Value | | 2024 | 24,461,664 | | 2023 | 24,099,517 | | 2022 | 23,102,332 | | 2021 | 22,117,623 | | 2020 | 20,424,164 | | 2019 | 22,009,891 | | 2018 | 20,988,630 | | 2017 | 20,424,390 | | 2016 | 20,271,418 | | 2015 | 19,922,777 | | 2014 | 19,429,151 | | 2013 | 19,506,062 | | 2012 | 19,160,079 | | 2011 | 18,355,398 | | 2010 | 17,805,081 | | 2009 | 17,502,236 | | 2008 | 16,940,139 | | 2007 | 16,648,546 | | 2006 | 16,161,285 | | 2005 | 15,393,005 | | 2004 | 14,700,650 | | 2003 | 14,007,716 | | 2002 | 13,497,277 | | 2001 | 13,194,071 | | 2000 | 13,129,488 | | 1999 | 12,721,647 | | 1998 | 12,680,512 | | 1997 | 12,481,048 | | 1996 | 11,575,264 | | 1995 | 11,266,806 | | 1994 | 10,620,242 | | 1993 | 10,197,063 | | 1992 | 9,690,746 | | 1991 | 9,210,964 | | 1990 | 8,871,436 |
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