Year	Number
1996	7.03517580032349
1998	14.5
2000	12.4378108978271
2002	9.45273590087891
2003	12.93532371521
2004	13.4615383148193
2005	11.0047845840454
2006	11.4832534790039
2007	11.0047845840454
2008	12.5
2009	12.7962083816528
2010	13.2701425552368
2011	13.6150236129761
2012	15.4929580688477
2013	14.5539903640747
2014	18.269229888916
2015	13.8095235824585
2016	13.3333330154419
2017	14.2857141494751
2018	12.380952835083
2019	11.4285717010498
2020	11.4285717010498
2021	12.8571424484253
2022	15.5660381317139