Year	Number of
1990	485.11
1991	513.28
1992	540.48
1993	572.53
1994	602.48
1995	633.58
1996	668.35
1997	706.84
1998	730.6
1999	771.57
2000	835.25
2001	880.51
2002	917.88
2003	948.62
2004	988.22
2005	1032.28
2006	1069.39
2007	1117.19
2008	1153.52
2009	1194.92
2010	1274.98
2011	1305.21
2012	1343.19
2013	1367.52
2014	1375.84
2015	1368.89
2016	1368.59