Year	Number of
1990	379.34
1991	393.45
1992	412.74
1993	429
1994	452.78
1995	462.75
1996	476.87
1997	490.7
1998	509.22
1999	529.89
2000	540.92
2001	556.28
2002	577.44
2003	611.55
2004	650.57
2005	694.94
2006	725.25
2007	750.52
2008	787.26
2009	827.85
2010	876.67
2011	925.01
2012	979.6
2013	1031.77
2014	1073.68
2015	1122.74
2016	1179.91