Year	Number of
1990	280.14
1991	311.59
1992	346.65
1993	388.15
1994	430.62
1995	473.09
1996	494.64
1997	516.7
1998	532.46
1999	548.76
2000	566.85
2001	586.75
2002	607.74
2003	632.89
2004	660.09
2005	692.32
2006	712.44
2007	735.37
2008	762.4
2009	794.34
2010	832
2011	860.71
2012	898.54
2013	936.2
2014	978.48
2015	1028.91
2016	1085.67