Year	Number of
1990	460.27
1991	473.03
1992	493.22
1993	505.32
1994	523.62
1995	537.1
1996	543.91
1997	562.86
1998	585.46
1999	611.17
2000	636.79
2001	646.3
2002	662.15
2003	694.9
2004	736.47
2005	772.73
2006	776.36
2007	776.69
2008	798.67
2009	805.76
2010	811.4
2011	829.94
2012	845.83
2013	862.53
2014	879.04
2015	905.52
2016	932.89