Year	Number of
1990	215.68
1991	230.54
1992	246.27
1993	262.57
1994	280.14
1995	299.24
1996	312.62
1997	327.04
1998	342.65
1999	359.43
2000	377.57
2001	391.59
2002	406.33
2003	423.37
2004	441.26
2005	460.09
2006	482.48
2007	505.97
2008	530.46
2009	555.99
2010	582.92
2011	607.19
2012	633.1
2013	659.93
2014	689.01
2015	720.33
2016	752.2