Year	number
2005	60
2006	61.1875
2007	60
2008	58.3125
2009	56.294117647058826
2010	51.588235294117645
2011	44.23529411764706
2012	35.05882352941177
2013	34.294117647058826
2014	27.294117647058822
2015	24.470588235294116
2016	19.764705882352942
2017	16.58823529411765
2018	16.764705882352942
2019	14.647058823529411