Year	Number of
1990	386.94
1991	426.33
1992	473.91
1993	535.18
1994	608.73
1995	690.73
1996	772.39
1997	845.66
1998	904.15
1999	959.04
2000	1005.83
2001	1051.11
2002	1096.18
2003	1144.6
2004	1188.69
2005	1223.55
2006	1258.44
2007	1288.02
2008	1323.55
2009	1357.25
2010	1390.31
2011	1420
2012	1453.9
2013	1504.55
2014	1552.59
2015	1603.05
2016	1664.76