| Year | Value | | 2023 | 14,184,361 | | 2022 | 13,970,925 | | 2021 | 13,623,766 | | 2020 | 13,371,680 | | 2019 | 13,403,597 | | 2018 | 13,249,966 | | 2017 | 13,093,345 | | 2016 | 12,913,664 | | 2015 | 12,741,960 | | 2014 | 12,579,726 | | 2013 | 12,404,289 | | 2012 | 12,225,969 | | 2011 | 12,035,107 | | 2010 | 11,680,604 | | 2009 | 11,313,657 | | 2008 | 11,103,030 | | 2007 | 10,910,271 | | 2006 | 10,734,030 | | 2005 | 10,548,387 | | 2004 | 10,360,242 | | 2003 | 10,177,216 | | 2002 | 9,951,478 | | 2001 | 9,717,598 | | 2000 | 9,490,794 | | 1999 | 9,263,024 | | 1998 | 9,089,993 | | 1997 | 8,884,329 | | 1996 | 8,687,886 | | 1995 | 8,470,833 | | 1994 | 8,252,747 | | 1993 | 7,989,730 | | 1992 | 7,750,070 | | 1991 | 7,412,254 |
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