Year | Value | 2023 | 23,788,645 | 2022 | 23,687,273 | 2021 | 23,384,158 | 2020 | 22,838,137 | 2019 | 23,139,046 | 2018 | 22,930,164 | 2017 | 22,897,891 | 2016 | 22,977,372 | 2015 | 23,036,096 | 2014 | 23,091,303 | 2013 | 23,332,032 | 2012 | 23,569,775 | 2011 | 23,558,862 | 2010 | 23,482,007 | 2009 | 23,364,217 | 2008 | 23,150,283 | 2007 | 22,508,326 | 2006 | 21,880,145 | 2005 | 21,197,697 | 2004 | 20,419,303 | 2003 | 19,731,180 | 2002 | 18,960,316 | 2001 | 18,127,540 | 2000 | 18,242,081 | 1999 | 17,726,769 | 1998 | 17,408,242 | 1997 | 17,144,954 | 1996 | 16,812,772 | 1995 | 16,540,582 | 1994 | 16,414,513 | 1993 | 16,072,158 | 1992 | 15,839,409 | 1991 | 15,616,294 |
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