Year	Number
1996	11.18495
1997	11.205
1998	11.25041
1999	11.27157
2000	11.31734
2001	11.41741
2002	11.50202
2003	11.57095
2004	11.42852
2005	11.30978
2006	11.06086
2007	10.88874
2008	10.75603
2009	10.68708
2010	10.76379
2011	10.68817
2012	10.53622
2013	10.97792
2014	10.82036
2015	10.61154
2016	10.39485
2017	10.35177
2018	10.3459