Year	Number
1993	11.60502
1994	11.64445
1995	11.74027
1996	11.55764
1997	11.33374
1998	10.76432
1999	11.55338
2000	11.65562
2001	11.56654
2002	11.56667
2003	11.55638
2004	11.51967
2005	11.48002
2006	11.26617
2007	11.03763
2008	10.9261
2009	10.872
2010	10.90598
2011	10.81285
2012	10.81748
2013	10.96848
2014	10.76754
2015	10.58406
2016	10.42315
2017	10.47115
2018	10.49065