Year	Number of
1990	57467.3
1991	59967.05
1992	62815.84
1993	66030.09
1994	69366.16
1995	72803.19
1996	76631.18
1997	80445.22
1998	84362.36
1999	88658.42
2000	93483.92
2001	99082.43
2002	105178.9
2003	111863.7
2004	119109.27
2005	126992.31
2006	134856.21
2007	143401.01
2008	152977.97
2009	163269.21
2010	174370.54
2011	183993.97
2012	194280.41
2013	205282.73
2014	217194.44
2015	230129.41
2016	243886.44