Year	Number of
1990	300.5
1991	317.74
1992	336.39
1993	357.81
1994	380.52
1995	404.74
1996	419.95
1997	436.43
1998	455.93
1999	477.32
2000	500.73
2001	527.32
2002	555.25
2003	587.26
2004	620.8
2005	656.16
2006	702.6
2007	751.51
2008	809.92
2009	872.3
2010	939.66
2011	1003.2
2012	1074.09
2013	1152.67
2014	1239.68
2015	1335.92
2016	1434.02