Year	Number
1996	30.4347820281982
1998	34.7826080322266
2000	31.5217399597168
2002	21.0810813903809
2003	18.9189186096191
2004	16.9154224395752
2005	30.8823528289795
2006	24.0196075439453
2007	25.7281551361084
2008	30.5825233459473
2009	33.0143547058105
2010	33.0143547058105
2011	34.5971565246582
2012	35.5450248718262
2013	37.4407577514648
2014	31.730770111084
2015	29.5238094329834
2016	26.6666660308838
2017	28.0952377319336
2018	29.5238094329834
2019	28.0952377319336
2020	25.7142848968506
2021	30
2022	20.2830181121826