Year	Number
1996	-0.17498953640461
1998	-0.097585991024971
2000	-0.309992283582687
2002	-0.327785730361938
2003	-0.383329838514328
2004	-0.644271314144135
2005	-0.699575066566467
2006	-0.732252717018127
2007	-0.574792742729187
2008	-0.629991829395294
2009	-0.60438460111618
2010	-0.500350832939148
2011	-0.46942475438118
2012	-0.359967857599258
2013	-0.378246128559113
2014	-0.581343531608582
2015	-0.676364421844482
2016	-0.60018265247345
2017	-0.395686626434326
2018	-0.329635828733444
2019	-0.790492653846741
2020	-0.725854098796844
2021	-0.762389004230499
2022	-0.563976764678955