Year	Number
1993	11.48803
1994	11.48595
1995	11.53264
1996	11.59201
1997	11.9609
1998	13.36129
1999	12.06831
2000	11.7126
2001	11.8532
2002	11.98982
2003	12.08518
2004	11.71876
2005	11.52171
2006	11.48246
2007	11.3767
2008	11.40949
2009	11.44857
2010	11.55701
2011	11.60737
2012	11.48958
2013	12.25138
2014	12.36069
2015	12.27296
2016	12.01514
2017	11.94042
2018	11.92749