Year	Number
1996	16.5
1998	13.9303483963013
2000	12.93532371521
2002	14.9253730773926
2003	16.9154224395752
2004	8.17307662963867
2005	13.4615383148193
2006	18.75
2007	24.519229888916
2008	15.384614944458
2009	14.6919431686401
2010	15.6398105621338
2011	15.023473739624
2012	15.4929580688477
2013	15.023473739624
2014	16.7487678527832
2015	19.2118225097656
2016	22.1674880981445
2017	21.674877166748
2018	18.4466018676758
2019	20.7729473114014
2020	20.2898559570313
2021	21.2560386657715
2022	22.7053146362305