Year	Number of
1990	370.94
1991	384.26
1992	398.02
1993	410.24
1994	427.25
1995	450
1996	483.96
1997	522.19
1998	562.98
1999	603.62
2000	643.89
2001	681.57
2002	720.98
2003	770.33
2004	824.24
2005	883.99
2006	917.89
2007	954.61
2008	997.03
2009	1040.73
2010	1085.06
2011	1097.35
2012	1108.67
2013	1119.71
2014	1131.7
2015	1145.51
2016	1160.22