Year	Number of
1990	370.36
1991	376.6
1992	386.34
1993	398.7
1994	412
1995	425.74
1996	436.8
1997	447.79
1998	459.32
1999	471.49
2000	485.03
2001	494.32
2002	504.75
2003	516.44
2004	528.7
2005	541.8
2006	555.63
2007	569.73
2008	585.59
2009	602.23
2010	620.15
2011	639.18
2012	659.73
2013	681.23
2014	703.93
2015	727.83
2016	752.99