Year	Number of
1990	438.88
1991	446.1
1992	453.2
1993	465.97
1994	466.22
1995	470.67
1996	475.82
1997	482.76
1998	491.39
1999	500.75
2000	508.47
2001	521.41
2002	528.02
2003	543.54
2004	558.94
2005	576.39
2006	585.94
2007	595.39
2008	605.29
2009	617.49
2010	632.28
2011	644.3
2012	658.64
2013	672.49
2014	688.03
2015	703.98
2016	721.2