Year	Number
1995	14.02267
1996	13.70084
1997	13.74006
1998	13.53395
1999	13.01032
2000	12.43584
2001	12.70587
2002	12.79852
2003	13.05152
2004	12.08512
2005	11.33992
2006	11.29174
2007	11.22138
2008	11.03265
2009	10.78595
2010	10.6326
2011	10.33829
2012	10.12762
2013	10.98159
2014	11.02954
2015	10.67695
2016	10.47361
2017	10.42113
2018	10.47686