Year	Number of
1990	193.95
1991	191.18
1992	189.54
1993	197.44
1994	201.33
1995	196.74
1996	179.03
1997	172.53
1998	177.87
1999	172.92
2000	166.64
2001	178.27
2002	179.38
2003	188.54
2004	191.68
2005	200.85
2006	212.32
2007	210.43
2008	199.58
2009	196.37
2010	193.68
2011	193.06
2012	188.6
2013	194.63
2014	188.91
2015	188.57
2016	188.91