Year	Number of
1990	326.63
1991	346.55
1992	367.19
1993	388.23
1994	425.16
1995	453.72
1996	482.63
1997	511.69
1998	544.08
1999	582.13
2000	617.56
2001	647.25
2002	673.32
2003	699.16
2004	726.76
2005	758.69
2006	775.28
2007	782.88
2008	790.4
2009	794.2
2010	810.07
2011	815.12
2012	816.36
2013	819.35
2014	831.24
2015	855.42
2016	878.55