| Year | Value | | 2022 | 20,552,979 | | 2021 | 22,124,839 | | 2020 | 20,390,671 | | 2019 | 20,874,130 | | 2018 | 20,467,520 | | 2017 | 19,986,482 | | 2016 | 18,264,520 | | 2015 | 18,121,390 | | 2014 | 16,911,811 | | 2013 | 21,716,357 | | 2012 | 20,787,080 | | 2011 | 19,479,105 | | 2010 | 18,067,970 | | 2009 | 17,307,459 | | 2008 | 14,948,640 | | 2007 | 11,897,563 | | 2006 | 7,178,745 | | 2005 | 4,510,067 | | 2004 | 3,168,256 | | 2003 | 2,034,776 | | 2002 | 1,577,085 | | 2001 | 1,146,441 | | 2000 | 856,831 | | 1999 | 337,800 | | 1998 | 111,445 | | 1997 | 64,194 | | 1996 | 43,421 | | 1995 | 29,999 | | 1994 | 10,462 | | 1993 | 2,990 | | 1992 | 2,141 | | 1991 | 1,221 | | 1990 | 293 |
|