Year	Number of
1990	218258.83
1991	226126.28
1992	234393.27
1993	242811.95
1994	251241.26
1995	260188.45
1996	261566.28
1997	263457.58
1998	265855.17
1999	268119.15
2000	270650.81
2001	270809.91
2002	271976.05
2003	273722.26
2004	275752.22
2005	278347.17
2006	283738.91
2007	290191.95
2008	297328.49
2009	304717.04
2010	312463.19
2011	321831.74
2012	332248.61
2013	342779.36
2014	351865.93
2015	361610.77
2016	371671.61