Year	Number of
1990	293.47
1991	307.17
1992	321.38
1993	338.03
1994	354.66
1995	373.58
1996	391.08
1997	411.06
1998	433.21
1999	453.88
2000	473.28
2001	491.44
2002	510.65
2003	533.7
2004	556.74
2005	580.66
2006	603.78
2007	628.21
2008	658.45
2009	689.62
2010	721.1
2011	751.09
2012	782.19
2013	813.64
2014	850.41
2015	885.84
2016	919.63