Year	Number of
1990	546
1991	547.1
1992	549.15
1993	551.74
1994	573.09
1995	596.6
1996	607.28
1997	622.76
1998	646.3
1999	656.77
2000	666.73
2001	667.83
2002	676.04
2003	693.7
2004	713.61
2005	737.62
2006	765.83
2007	757.18
2008	782.14
2009	829.54
2010	859.43
2011	908.24
2012	949.58
2013	986.36
2014	1021.34
2015	1041.77
2016	1077.54