Year	Number of
1990	492.09
1991	518.63
1992	555.07
1993	599.21
1994	644.87
1995	682.86
1996	706.9
1997	724.94
1998	738.47
1999	754.27
2000	775.86
2001	799.75
2002	819.88
2003	842.22
2004	866.87
2005	888.61
2006	906.57
2007	919.15
2008	932.84
2009	944.46
2010	959.41
2011	974.26
2012	990.53
2013	1011.71
2014	1035.67
2015	1061.47
2016	1090.29