Year | Value | 2023 | 25,158,403 | 2022 | 24,366,735 | 2021 | 23,621,462 | 2020 | 22,920,638 | 2019 | 24,142,655 | 2018 | 23,771,537 | 2017 | 23,776,332 | 2016 | 23,430,091 | 2015 | 23,120,551 | 2014 | 21,981,198 | 2013 | 21,678,833 | 2012 | 21,285,409 | 2011 | 21,055,801 | 2010 | 19,990,943 | 2009 | 21,088,301 | 2008 | 21,338,378 | 2007 | 21,021,772 | 2006 | 20,703,758 | 2005 | 20,382,896 | 2004 | 20,050,904 | 2003 | 19,692,815 | 2002 | 19,314,482 | 2001 | 18,926,590 | 2000 | 18,541,865 | 1999 | 18,179,270 | 1998 | 17,814,021 | 1997 | 17,443,141 | 1996 | 17,097,879 | 1995 | 16,792,468 | 1994 | 16,515,224 | 1993 | 16,273,778 | 1992 | 16,072,382 | 1991 | 15,867,850 |
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