Year	Number of
1990	483.54
1991	493.47
1992	504.26
1993	515.81
1994	528.56
1995	542.59
1996	557.52
1997	573.3
1998	589.28
1999	604.92
2000	619.93
2001	626.87
2002	632.92
2003	640.01
2004	647.77
2005	656.75
2006	668.3
2007	680.97
2008	695.48
2009	711.36
2010	728.66
2011	741.76
2012	756.07
2013	769.96
2014	785.95
2015	804.24
2016	823.8