Year	Number of
1990	519.42
1991	520.59
1992	486.52
1993	463.58
1994	442.84
1995	437.18
1996	443.02
1997	445.03
1998	479.38
1999	521.31
2000	561.6
2001	617.56
2002	685.31
2003	726.86
2004	793.08
2005	772.38
2006	767.83
2007	753.24
2008	760.97
2009	780.61
2010	770.19
2011	761.9
2012	763.86
2013	769.69
2014	819.2
2015	841.38
2016	869.65