Year	Number
1993	13.59144
1994	15.42276
1995	15.31293
1998	12.69146
1999	12.54847
2000	12.23353
2001	12.72177
2002	12.65986
2003	12.92198
2004	12.90834
2005	13.11521
2006	12.82908
2007	12.81319
2008	12.58767
2009	12.37334
2010	12.03266
2011	11.67085
2012	11.34508
2013	11.23021
2014	11.113
2015	11.15229
2016	11.0616
2017	11.06981