Year	Number of
1990	77.27
1991	82.95
1992	89.77
1993	97.21
1994	105.37
1995	114.01
1996	120.28
1997	126.18
1998	131.92
1999	137.7
2000	143.91
2001	151.77
2002	160.51
2003	170.97
2004	183.01
2005	196.94
2006	208.03
2007	220.84
2008	235.9
2009	252.01
2010	268.99
2011	284.55
2012	300.72
2013	317.59
2014	334.97
2015	352.92
2016	370.79