Year	Number of
1990	256.72
1991	270.34
1992	285.68
1993	302.98
1994	322.35
1995	345.68
1996	366.11
1997	388.15
1998	411.75
1999	436.91
2000	463.86
2001	483.49
2002	504.18
2003	526.76
2004	553.01
2005	584.25
2006	635.31
2007	694.74
2008	760.25
2009	824.88
2010	884.15
2011	920.41
2012	942.91
2013	957.35
2014	974.15
2015	1001.6
2016	1046.24