Year	Number of
1990	233
1991	239.24
1992	246.63
1993	256.01
1994	266.09
1995	275.32
1996	281.26
1997	288.66
1998	303.28
1999	313.27
2000	323.71
2001	338.18
2002	355.96
2003	378.82
2004	398.99
2005	418.72
2006	438.83
2007	457.42
2008	479.75
2009	501.38
2010	522.68
2011	545.09
2012	568.08
2013	591.41
2014	616.76
2015	643.11
2016	678.32