Year | Value | 2023 | 17,986,215 | 2022 | 18,300,937 | 2021 | 18,519,217 | 2020 | 18,245,536 | 2019 | 18,327,422 | 2018 | 18,388,899 | 2017 | 18,432,689 | 2016 | 18,371,736 | 2015 | 18,332,404 | 2014 | 18,392,967 | 2013 | 18,287,361 | 2012 | 18,268,758 | 2011 | 18,149,148 | 2010 | 18,055,100 | 2009 | 17,842,910 | 2008 | 17,577,553 | 2007 | 17,358,009 | 2006 | 17,372,553 | 2005 | 17,594,853 | 2004 | 17,315,015 | 2003 | 17,342,507 | 2002 | 17,427,664 | 2001 | 17,667,209 | 2000 | 17,472,615 | 1999 | 17,353,418 | 1998 | 17,377,008 | 1997 | 17,351,432 | 1996 | 17,464,302 | 1995 | 17,498,893 | 1994 | 17,663,642 | 1993 | 17,713,667 | 1992 | 17,750,645 | 1991 | 17,674,353 |
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