Year	Number of
1990	224
1991	219.74
1992	206.83
1993	190.95
1994	171.48
1995	162.65
1996	159.91
1997	163.53
1998	162.73
1999	163.51
2000	169.95
2001	172.94
2002	180
2003	192.19
2004	204.24
2005	201.33
2006	185.31
2007	173.73
2008	180.68
2009	184.21
2010	185.55
2011	183.41
2012	181.83
2013	179.24
2014	177.48
2015	175.41
2016	173.85