Year	Number of
1990	446.23
1991	476.35
1992	508.21
1993	541.68
1994	577.54
1995	616.74
1996	649.87
1997	686.44
1998	725.2
1999	765.3
2000	806.35
2001	837.73
2002	868.95
2003	900.12
2004	932.42
2005	966.65
2006	985.98
2007	1006.18
2008	1026.63
2009	1048.4
2010	1071.55
2011	1078.88
2012	1087.09
2013	1096.8
2014	1107.02
2015	1117.61
2016	1128.89