Year	Number
1982	52385
1983	50849
1984	48110
1985	57547
1986	81471
1987	77412
1988	93312
1989	101266
1990	115769
1991	116230
1992	151722
1993	196825
1994	212546
1995	229911
1996	259898
1999	247951
2000	338479
2001	299560
2002	288157
2003	312823
2004	361771
2005	388816
2006	429894
2007	448625
2008	451030
2009	344516
2010	436761
2011	484270
2012	501028
2013	538945
2014	511378