Year	Number
1996	30.4347820281982
1998	29.3478260040283
2000	21.7391300201416
2002	23.7837829589844
2003	17.8378372192383
2004	18.9054718017578
2005	15.6862745285034
2006	18.6274509429932
2007	19.9029121398926
2008	20.3883495330811
2009	23.4449768066406
2010	25.3588523864746
2011	26.0663509368896
2012	32.2274894714355
2013	31.2796211242676
2014	31.730770111084
2015	33.8095245361328
2016	38.0952377319336
2017	34.761905670166
2018	33.8095245361328
2019	36.6666679382324
2020	36.1904754638672
2021	32.3809509277344
2022	28.7735843658447