Year	Number of
1990	31810.3
1991	32139.5
1992	32431.79
1993	32707.33
1994	33051.9
1995	33518.46
1996	33389.97
1997	33256.72
1998	33125.83
1999	33033.17
2000	32963.67
2001	32807.35
2002	32553.42
2003	32242.67
2004	32092.25
2005	32075.4
2006	32084.37
2007	32036.29
2008	31930.25
2009	31889.01
2010	31969.37
2011	32463.42
2012	32904.61
2013	33290.74
2014	33890.72
2015	34526.21
2016	35201.32