Year	Number of
1990	579.34
1991	591.9
1992	606.49
1993	627.56
1994	642.7
1995	658.1
1996	673.11
1997	685.55
1998	700.67
1999	722.73
2000	746.06
2001	768.39
2002	793.19
2003	820.71
2004	846
2005	871.62
2006	897.27
2007	923.2
2008	954.68
2009	991.38
2010	1031.93
2011	1069.56
2012	1113.16
2013	1154.37
2014	1201.05
2015	1252.81
2016	1312.59