Year	Number of
1990	445.55
1991	471.79
1992	500.63
1993	531.37
1994	565.59
1995	603.85
1996	649.66
1997	699.92
1998	755.6
1999	815.62
2000	879.64
2001	900.77
2002	923.35
2003	947.37
2004	972.37
2005	998.93
2006	1027.93
2007	1059.01
2008	1093.61
2009	1133.47
2010	1179.25
2011	1214.9
2012	1255.27
2013	1296.34
2014	1339.91
2015	1385.43
2016	1431.75