Year	Number of
1990	29660
1991	30540
1992	32270
1993	34360
1994	36310
1995	37520
1996	39190
1997	40350
1998	40750
1999	41470
2000	42490
2001	42880
2002	43500
2003	43980
2004	44210
2005	43990
2006	44010
2007	43860
2008	43470
2009	42790
2010	42310
2011	41050
2012	39590
2013	38260
2014	37040
2015	36240