Year	Number
1982	17000
1983	19120
1984	26487
1985	43445
1986	45031
1987	40014
1988	41683
1989	43202
1990	50853
1991	59124
1992	79837
1993	107758
1994	117186
1995	144610
1996	122057
1997	118578
1998	129395
1999	140620
2000	181717
2001	229783
2002	321041
2003	405628
2004	527605
2005	593390
2006	669279
2007	604979
2008	590545
2009	741785
2010	973514
2011	1273859
2012	1502582
2013	1733387
2014	1997058