Year	Number of
1990	409.1
1991	439.34
1992	479.65
1993	530.48
1994	585.63
1995	634.19
1996	664.63
1997	687
1998	705.01
1999	727.42
2000	755.47
2001	788.67
2002	816.45
2003	845.67
2004	875.67
2005	902.06
2006	923.13
2007	937.04
2008	950.96
2009	961.15
2010	975.9
2011	991.73
2012	1011.46
2013	1036.49
2014	1065.52
2015	1095.95
2016	1131.4