Year	Number of
1990	2693.04
1991	2866.53
1992	3057.82
1993	3257.55
1994	3477.72
1995	3719.14
1996	3708.26
1997	3693.04
1998	3676.69
1999	3654.85
2000	3628.88
2001	3759.46
2002	3898.84
2003	4066.49
2004	4237.01
2005	4407.21
2006	4645.17
2007	4888.31
2008	5139.25
2009	5411.79
2010	5714.13
2011	5782.33
2012	5867.11
2013	5955.33
2014	6055
2015	6164.49
2016	6275.28