Year	Number of
1990	419.49
1991	428.34
1992	438.61
1993	449.74
1994	461.11
1995	473.02
1996	480.12
1997	487.56
1998	495.22
1999	503.11
2000	511.79
2001	527.75
2002	544.5
2003	563.52
2004	582.84
2005	603.16
2006	619.67
2007	636.51
2008	656.32
2009	677.28
2010	699.93
2011	721.7
2012	745.61
2013	768.31
2014	792.38
2015	817.86
2016	846.44