Year	Number of
1990	427.62
1991	438.53
1992	456.22
1993	474.08
1994	496.32
1995	514.11
1996	527.15
1997	545.24
1998	566.92
1999	575.49
2000	580.64
2001	577.82
2002	578.8
2003	597.99
2004	609.85
2005	625.51
2006	647.43
2007	671.82
2008	696.61
2009	724.63
2010	748.36
2011	777.74
2012	807.35
2013	849.23
2014	885.67
2015	923.9
2016	957.01