Year	Number of
1990	328.37
1991	349.39
1992	372.01
1993	396.67
1994	423.2
1995	451.89
1996	473.63
1997	496.76
1998	521.52
1999	547.32
2000	574.16
2001	602.16
2002	631.09
2003	661.57
2004	693.41
2005	726.84
2006	764.88
2007	805.18
2008	848.5
2009	893.89
2010	941.45
2011	991.33
2012	1043.73
2013	1099.1
2014	1157.39
2015	1218.84
2016	1283.6