Year	Number
1996	-1.21819484233856
1998	-1.19836211204529
2000	-1.24584436416626
2002	-0.636733174324036
2003	-0.605380773544312
2004	-0.616287350654602
2005	-0.773644506931305
2006	-0.775204539299011
2007	-0.791886448860168
2008	-0.767772257328033
2009	-0.82556688785553
2010	-0.816793382167816
2011	-0.845334827899933
2012	-0.812617719173431
2013	-0.693158984184265
2014	-0.804205596446991
2015	-0.942101240158081
2016	-0.917128682136536
2017	-0.925527453422546
2018	-0.807303428649902
2019	-0.861796259880066
2020	-0.800302982330322
2021	-0.832210958003998
2022	-0.832472681999207