Year	Number of
1990	403.14
1991	423.93
1992	445.94
1993	468.92
1994	495.46
1995	522.88
1996	548.99
1997	577.07
1998	607.14
1999	641.29
2000	675.77
2001	715.35
2002	757.56
2003	804.48
2004	855.6
2005	906.62
2006	964.9
2007	998.95
2008	1061.81
2009	1133.28
2010	1200.31
2011	1253.55
2012	1278.56
2013	1304.02
2014	1330.74
2015	1358.92
2016	1391.1