Year	Number
1996	18.2795696258545
1998	14.4385023117065
2000	13.297872543335
2002	28.5714282989502
2003	20.1058197021484
2004	20.6896553039551
2005	14.1463413238525
2006	11.2195119857788
2007	5.82524251937866
2008	6.7961163520813
2009	12.4401912689209
2010	7.61904764175415
2011	12.7962083816528
2012	14.6919431686401
2013	13.7440757751465
2014	13.4615383148193
2015	15.2380952835083
2016	15.2380952835083
2017	14.2857141494751
2018	13.3333330154419
2019	18.5714282989502
2020	18.0952377319336
2021	17.1428565979004
2022	18.3962268829346