Year	Number of
1990	353.72
1991	374.26
1992	397.85
1993	424.43
1994	454.03
1995	486.82
1996	490.96
1997	496.33
1998	502.69
1999	510.26
2000	519.17
2001	521.53
2002	525.42
2003	530.61
2004	537.06
2005	544.7
2006	557.06
2007	570.64
2008	585.55
2009	601.54
2010	618.74
2011	637.58
2012	658.03
2013	679.57
2014	702.48
2015	726.82
2016	752.73