Year	Number of
1990	274.33
1991	279.89
1992	286.67
1993	294.74
1994	302.99
1995	312.09
1996	322.84
1997	338.52
1998	353.88
1999	369.72
2000	385.77
2001	403.28
2002	421.88
2003	442.32
2004	463.75
2005	486.13
2006	507.03
2007	530.33
2008	552.94
2009	577.54
2010	602.02
2011	622.06
2012	640.34
2013	657.76
2014	678.56
2015	704.14
2016	730.24