Year Number 1992 557801 1993 585713.6875 1994 589800.0625 1995 592310.1875 1996 605166.125 1997 615504.75 1998 609741.5625 1999 611765.375 2000 620297.625 2001 616292.3125 2002 622894.875 2003 613061.1875 2004 609970.0625 2005 627405.4375 2006 617359.5625 2007 604181.9375 2008 588036 2009 578597 2010 568325 2011 580038 2012 570423.3125 2013 556596.875 2014 537088.4375 2015 534312.125 2016 528646.375 2017 523706.375 2018 498012.28125 2019 520411.6875 2020 572295.625 2021 582087.375 2022 592574.75