Year | Value | 2023 | 18,744,309 | 2022 | 18,835,784 | 2021 | 18,556,634 | 2020 | 18,432,923 | 2019 | 18,256,632 | 2018 | 18,335,086 | 2017 | 18,121,462 | 2016 | 18,208,465 | 2015 | 18,325,828 | 2014 | 18,287,831 | 2013 | 18,270,371 | 2012 | 18,997,441 | 2011 | 18,939,468 | 2010 | 18,064,406 | 2009 | 18,117,855 | 2008 | 18,200,813 | 2007 | 18,024,506 | 2006 | 17,564,030 | 2005 | 17,649,305 | 2004 | 17,143,358 | 2003 | 16,872,510 | 2002 | 16,611,035 | 2001 | 16,334,465 | 2000 | 16,002,599 | 1999 | 15,614,942 | 1998 | 15,595,649 | 1997 | 15,653,685 | 1996 | 15,209,792 | 1995 | 14,686,541 | 1994 | 14,160,101 | 1993 | 13,833,451 | 1992 | 13,496,205 | 1991 | 13,163,934 |
|