| Year | Value | | 2023 | 453,244 | | 2022 | 445,768 | | 2021 | 438,372 | | 2020 | 430,466 | | 2019 | 428,081 | | 2018 | 421,186 | | 2017 | 414,387 | | 2016 | 408,074 | | 2015 | 402,423 | | 2014 | 396,948 | | 2013 | 392,037 | | 2012 | 393,133 | | 2011 | 394,381 | | 2010 | 395,813 | | 2009 | 397,425 | | 2008 | 398,675 | | 2007 | 400,120 | | 2006 | 402,088 | | 2005 | 405,064 | | 2004 | 409,445 | | 2003 | 413,584 | | 2002 | 416,783 | | 2001 | 419,161 | | 2000 | 420,563 | | 1999 | 420,736 | | 1998 | 415,072 | | 1997 | 408,549 | | 1996 | 401,551 | | 1995 | 394,181 | | 1994 | 386,246 | | 1993 | 378,332 | | 1992 | 370,539 | | 1991 | 362,794 |
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