Year	Number of
1990	7301.51
1991	7196.88
1992	7338.43
1993	7479.97
1994	7641.47
1995	7954.48
1996	8093.32
1997	8135.74
1998	8310.8
1999	8405.43
2000	8850.68
2001	8820.98
2002	8921.58
2003	9039.04
2004	9610.07
2005	10261.05
2006	10780.28
2007	11377.4
2008	11645.04
2009	12046.77
2010	12678.35
2011	13446.13
2012	14510.11
2013	15514.31
2014	16788.35
2015	17833.31
2016	18782.81