Year	Number of
1990	401.82
1991	420.56
1992	441.12
1993	462.14
1994	480.49
1995	495.23
1996	507.57
1997	526.29
1998	537.51
1999	558.31
2000	574.41
2001	590.74
2002	617.07
2003	637.66
2004	658.84
2005	681.51
2006	701.7
2007	722.66
2008	744.07
2009	766.58
2010	790.96
2011	813.24
2012	838.72
2013	863.47
2014	889.28
2015	916.26
2016	941.9