Year	Number of
1990	301.59
1991	309.26
1992	320.23
1993	329.16
1994	342.29
1995	348.98
1996	355.82
1997	362.05
1998	370.08
1999	381.41
2000	388.71
2001	401.97
2002	417.4
2003	435.84
2004	456.49
2005	479.75
2006	497.02
2007	514.43
2008	536.42
2009	560.52
2010	589.59
2011	616.12
2012	646.94
2013	679.18
2014	709.93
2015	745.01
2016	781.48