Year	Number of
1990	6366.48
1991	6490.41
1992	6611.85
1993	6732.34
1994	6847.77
1995	6966.78
1996	7146.09
1997	7330.51
1998	7519.37
1999	7706.22
2000	7900.32
2001	8050.29
2002	8208.22
2003	8370.63
2004	8532.74
2005	8704.93
2006	8800.38
2007	8895.74
2008	8991.86
2009	9091.17
2010	9197.1
2011	9444.96
2012	9688.7
2013	9932.9
2014	10177.58
2015	10422.77
2016	10670.81