Year | Value | 2023 | 18,529,435 | 2022 | 18,268,448 | 2021 | 17,866,091 | 2020 | 16,830,784 | 2019 | 18,527,166 | 2018 | 18,029,865 | 2017 | 17,556,265 | 2016 | 16,861,950 | 2015 | 16,688,971 | 2014 | 16,683,502 | 2013 | 16,618,192 | 2012 | 16,520,323 | 2011 | 16,342,847 | 2010 | 16,255,080 | 2009 | 15,918,391 | 2008 | 15,644,447 | 2007 | 15,442,460 | 2006 | 14,824,999 | 2005 | 14,024,859 | 2004 | 13,601,183 | 2003 | 13,164,270 | 2002 | 12,717,766 | 2001 | 12,261,413 | 2000 | 11,468,982 | 1999 | 11,605,641 | 1998 | 11,099,974 | 1997 | 10,627,067 | 1996 | 10,134,298 | 1995 | 9,654,603 | 1994 | 9,076,469 | 1993 | 8,697,441 | 1992 | 8,334,493 | 1991 | 8,143,285 |
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