Year	Number
1996	-0.0101162660866976
1998	0.352346479892731
2000	0.280279636383057
2002	0.545502603054047
2003	0.593708753585815
2004	0.696617662906647
2005	0.597055912017822
2006	0.370951920747757
2007	0.521369874477386
2008	0.52541184425354
2009	0.511492669582367
2010	0.429740220308304
2011	0.346452385187149
2012	0.253650158643723
2013	0.326401859521866
2014	0.413401126861572
2015	0.400236338376999
2016	0.430590718984604
2017	0.41926383972168
2018	0.38398140668869
2019	0.464157700538635
2020	0.455399364233017
2021	0.441886842250824
2022	0.438828617334366