Year	Number
1999	9.47476
2001	9.42618
2002	9.59742
2003	10.01511
2005	11.11909
2006	10.86455
2007	10.7733
2008	10.72347
2009	10.85675
2010	10.87553
2011	11.14602
2013	7.75931
2014	7.58856
2016	7.40401