| Year | Value | | 2023 | 40,813,511 | | 2022 | 40,907,648 | | 2021 | 40,356,693 | | 2020 | 40,206,906 | | 2019 | 39,952,396 | | 2018 | 40,229,448 | | 2017 | 39,798,925 | | 2016 | 39,942,542 | | 2015 | 40,201,742 | | 2014 | 40,209,226 | | 2013 | 40,085,032 | | 2012 | 41,198,445 | | 2011 | 40,871,917 | | 2010 | 39,447,288 | | 2009 | 39,613,757 | | 2008 | 39,500,136 | | 2007 | 39,112,784 | | 2006 | 38,276,335 | | 2005 | 38,143,753 | | 2004 | 37,474,638 | | 2003 | 36,730,283 | | 2002 | 36,214,889 | | 2001 | 35,667,412 | | 2000 | 34,800,731 | | 1999 | 34,134,551 | | 1998 | 33,973,096 | | 1997 | 33,854,888 | | 1996 | 33,148,803 | | 1995 | 32,441,917 | | 1994 | 31,715,644 | | 1993 | 31,090,190 | | 1992 | 30,431,209 | | 1991 | 29,754,025 |
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