Year	Number of
1990	419.6
1991	435.93
1992	451.88
1993	467.84
1994	484.92
1995	505.26
1996	523.92
1997	546.86
1998	570.63
1999	595.34
2000	622.02
2001	648.81
2002	676.75
2003	705.38
2004	733.51
2005	763.37
2006	790.7
2007	816.65
2008	839.84
2009	862.12
2010	884.03
2011	902.95
2012	919.17
2013	936.79
2014	952.68
2015	967.73
2016	982.69