Year	Number of
1990	9718.35
1991	10100.81
1992	10509.98
1993	10924.82
1994	11347.65
1995	11793.51
1996	12102.59
1997	12431.62
1998	12774.66
1999	13122.14
2000	13477.78
2001	13722.14
2002	13970.08
2003	14217.7
2004	14481.04
2005	14760.37
2006	14854.65
2007	14960.48
2008	15070.64
2009	15187.49
2010	15312.46
2011	15400.68
2012	15479.33
2013	15582.76
2014	15686.77
2015	15791.34
2016	15899.54