Year	Number of
1990	648.52
1991	697.47
1992	754.14
1993	818.4
1994	891.12
1995	971.79
1996	1002.15
1997	1033.68
1998	1065.72
1999	1097.09
2000	1127.95
2001	1137.35
2002	1146.84
2003	1162.93
2004	1182.95
2005	1207.83
2006	1221.02
2007	1236.91
2008	1256.6
2009	1276.09
2010	1294.72
2011	1323.93
2012	1353.09
2013	1379.4
2014	1408.19
2015	1440.89
2016	1478.43