Year | Value | 2021 | 20,299,619 | 2020 | 20,585,937 | 2019 | 21,148,251 | 2018 | 21,244,133 | 2017 | 21,345,004 | 2016 | 21,453,122 | 2015 | 21,563,197 | 2014 | 21,670,714 | 2013 | 21,834,999 | 2012 | 21,940,939 | 2011 | 22,037,073 | 2010 | 22,140,771 | 2009 | 22,246,256 | 2008 | 22,353,775 | 2007 | 22,455,476 | 2006 | 22,365,498 | 2005 | 22,529,601 | 2004 | 22,682,516 | 2003 | 22,824,874 | 2002 | 22,951,193 | 2001 | 23,064,790 | 2000 | 23,195,753 | 1999 | 23,329,207 | 1998 | 23,445,196 | 1997 | 23,579,292 | 1996 | 23,759,025 | 1995 | 23,948,277 | 1994 | 24,130,511 | 1993 | 24,266,616 | 1992 | 24,293,893 | 1991 | 24,269,840 |
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