Year	Number of
1990	452.43
1991	461.29
1992	462.06
1993	485.2
1994	496.84
1995	512.74
1996	520.22
1997	540.68
1998	558.76
1999	556.81
2000	574.77
2001	593.1
2002	617.38
2003	638.44
2004	659.7
2005	680.72
2006	695.7
2007	711.1
2008	729.25
2009	749.13
2010	772.89
2011	792.43
2012	813.46
2013	843.06
2014	870.32
2015	901.07
2016	931.82