Year	Number of
1990	11177.03
1991	11399.76
1992	11738.21
1993	12044.26
1994	12292.43
1995	12477.53
1996	12771.29
1997	13086.53
1998	13232.13
1999	13501.94
2000	13779.99
2001	14112.22
2002	14445.92
2003	14688.64
2004	14931.15
2005	15265.94
2006	15506.73
2007	15799.31
2008	16166.16
2009	16497.21
2010	17000.95
2011	17371.34
2012	17788.42
2013	18239.29
2014	19244.7
2015	20315.87
2016	21523.39