Year	Number of
1990	414.63
1991	416.25
1992	428.57
1993	450.36
1994	455.86
1995	466.78
1996	476.72
1997	487.92
1998	491.23
1999	499.86
2000	517.94
2001	511.36
2002	524.76
2003	528.31
2004	541.23
2005	563.13
2006	582.3
2007	601.95
2008	610.43
2009	624.29
2010	641.25
2011	650.47
2012	658.26
2013	666.99
2014	673.18
2015	681.56
2016	690.87