Year	Number of
1990	5431.25
1991	5582.01
1992	5726.69
1993	5862.01
1994	5988.85
1995	6124.73
1996	6292.08
1997	6426.8
1998	6621.9
1999	6804.37
2000	7034.63
2001	7127.1
2002	7226.65
2003	7347.7
2004	7386.87
2005	7512.01
2006	7936.07
2007	8286.19
2008	8594.52
2009	8938.58
2010	9205.89
2011	9278.71
2012	9377.45
2013	9436.62
2014	9575.17
2015	9722.11
2016	9872.87