Year	Number of
1990	489.16
1991	513.41
1992	540.13
1993	569.05
1994	599.82
1995	632.48
1996	659.03
1997	687.18
1998	717.55
1999	750.6
2000	787.02
2001	810.55
2002	835.65
2003	863.51
2004	892.81
2005	923.73
2006	956.47
2007	991.14
2008	1027.77
2009	1065.16
2010	1103.24
2011	1146.43
2012	1191.71
2013	1236.31
2014	1284.45
2015	1336.92
2016	1389.76