Year	Number of
1990	30847.81
1991	31721.26
1992	32454.69
1993	33090.83
1994	33451.94
1995	33602.46
1996	33221.98
1997	32537.87
1998	32181.1
1999	31781.71
2000	31299.54
2001	30983.33
2002	30705.49
2003	30307.91
2004	29991.46
2005	29765.18
2006	29552.37
2007	29626.42
2008	29750.68
2009	29912.07
2010	30283.42
2011	30599.17
2012	31081.53
2013	31860.45
2014	32741.81
2015	34181.01
2016	35467.55