Year	Number of
1990	294.77
1991	309.54
1992	326.66
1993	345.72
1994	365.64
1995	384.87
1996	402.4
1997	418.63
1998	435.09
1999	454.28
2000	473.4
2001	490.11
2002	505.7
2003	522.41
2004	541.32
2005	560.54
2006	577.5
2007	591.64
2008	604.73
2009	616.1
2010	627.78
2011	642.29
2012	661.98
2013	684.07
2014	707.11
2015	729.86
2016	754.88