Year	Number of
1990	117
1991	123.53
1992	133.14
1993	143.77
1994	154.16
1995	166.78
1996	173.55
1997	177.82
1998	185.64
1999	191.23
2000	198.18
2001	202.41
2002	205.23
2003	208.92
2004	215.68
2005	217.16
2006	223.01
2007	226.07
2008	230.88
2009	236.68
2010	243.62
2011	252
2012	261.46
2013	270.12
2014	278.54
2015	286.78
2016	295.53