Year	Number of
1990	294
1991	301.48
1992	306.49
1993	321.79
1994	328.87
1995	334.41
1996	336.53
1997	336.89
1998	347
1999	364.02
2000	371.88
2001	388.58
2002	403.61
2003	415.27
2004	427.91
2005	437.33
2006	445.56
2007	453.76
2008	462.67
2009	472.6
2010	483.21
2011	498.97
2012	516.05
2013	534.29
2014	553.87
2015	575.09
2016	594.77