Year	Number
1999	14.14065
2000	14.30527
2001	14.54672
2002	14.25036
2003	16.17482
2004	15.97246
2005	15.01919
2006	13.89067
2007	14.56587
2009	13.82081
2010	14.14972
2015	16.55146
2016	13.57949