Year	Number of
1990	844.91
1991	853.65
1992	868.1
1993	888.35
1994	912.52
1995	943.71
1996	963.12
1997	992.47
1998	987.83
1999	997.93
2000	1011.39
2001	1010.13
2002	1012.86
2003	1020.36
2004	1031.11
2005	1039.94
2006	1052.82
2007	1070.03
2008	1084.38
2009	1096.28
2010	1111.43
2011	1123.22
2012	1150.62
2013	1168.56
2014	1184.79
2015	1216.41
2016	1243.13