Year	Number
2004	6.96517419815063
2005	16.1764698028564
2006	11.2195119857788
2007	16.019416809082
2008	16.990291595459
2009	22.0095691680908
2010	25.3588523864746
2011	22.748815536499
2012	21.8009471893311
2013	21.8009471893311
2014	28.365385055542
2015	18.0952377319336
2016	19.5238094329834
2017	20.9523811340332
2018	38.0952377319336
2019	36.1904754638672
2020	38.5714302062988
2021	36.6666679382324
2022	21.2264156341553