Year	Number of
1990	5220.72
1991	5371.01
1992	5536.85
1993	5734.5
1994	5936.48
1995	6169.65
1996	6430.43
1997	6734.95
1998	7051.12
1999	7392.9
2000	7772.33
2001	8141.32
2002	8518.86
2003	8910.8
2004	9331.48
2005	9783.17
2006	10042.95
2007	10318
2008	10639.6
2009	10940.62
2010	11237.54
2011	11552.85
2012	11899.74
2013	12266.32
2014	12656.77
2015	13105.46
2016	13518.82