Year	Number of
1990	396.58
1991	407.55
1992	420.78
1993	439.88
1994	444.47
1995	457.77
1996	469.24
1997	486.11
1998	499.41
1999	504.24
2000	518.28
2001	527.85
2002	550.62
2003	570.16
2004	589.72
2005	599.24
2006	614.84
2007	634.6
2008	662.51
2009	695.25
2010	729.65
2011	758.08
2012	789.47
2013	822.6
2014	855.72
2015	891.65
2016	921.84