Year	Number of
1990	7672.79
1991	7976.48
1992	8243.11
1993	8557.36
1994	8954.48
1995	9438.11
1996	9764.21
1997	10078.86
1998	10170.05
1999	10403.05
2000	10764.13
2001	10988.97
2002	11296.16
2003	11584.37
2004	11905.27
2005	12327.6
2006	12715.46
2007	13109.07
2008	13540.46
2009	13983.39
2010	14434.48
2011	14672.02
2012	14901.49
2013	15117.45
2014	15250.91
2015	15229.77
2016	15310.87