Year	Number of
1990	493.41
1991	519.32
1992	552.14
1993	586.55
1994	634.12
1995	667.73
1996	705.51
1997	737.64
1998	763.42
1999	774.4
2000	781.73
2001	787.42
2002	797.31
2003	807.68
2004	812.35
2005	821.1
2006	829.78
2007	831.97
2008	829.58
2009	827.05
2010	824.64
2011	819.78
2012	824.42
2013	833.21
2014	843.8
2015	853.06
2016	862.44