Year	Number of
1990	214.64
1991	226.92
1992	219.8
1993	241.19
1994	244.81
1995	230.48
1996	211.76
1997	201.56
1998	200.74
1999	185.63
2000	189.65
2001	190.92
2002	180.32
2003	180.34
2004	173.67
2005	178.11
2006	176.86
2007	174.49
2008	170.3
2009	161.01
2010	150.29
2011	154
2012	151.01
2013	149
2014	145.05
2015	141.05
2016	139.08