| Year | Value | | 2023 | 11,965,019 | | 2022 | 11,592,475 | | 2021 | 11,098,782 | | 2020 | 10,815,307 | | 2019 | 10,593,291 | | 2018 | 10,284,558 | | 2017 | 9,995,553 | | 2016 | 9,710,777 | | 2015 | 9,409,632 | | 2014 | 9,090,658 | | 2013 | 8,923,111 | | 2012 | 8,788,788 | | 2011 | 8,654,090 | | 2010 | 8,515,123 | | 2009 | 8,476,630 | | 2008 | 8,418,157 | | 2007 | 8,341,459 | | 2006 | 8,098,945 | | 2005 | 7,867,487 | | 2004 | 7,642,255 | | 2003 | 7,418,531 | | 2002 | 7,197,125 | | 2001 | 6,982,382 | | 2000 | 6,779,400 | | 1999 | 6,587,130 | | 1998 | 6,398,073 | | 1997 | 6,210,102 | | 1996 | 6,025,841 | | 1995 | 5,848,303 | | 1994 | 5,679,377 | | 1993 | 5,514,372 | | 1992 | 5,354,474 | | 1991 | 5,201,298 |
|