Year	Number
1996	-0.389609158039093
1998	-0.323169857263565
2000	-0.504357814788818
2002	-0.657884895801544
2003	-0.537339866161346
2004	-0.759292542934418
2005	-0.72323077917099
2006	-0.529868960380554
2007	-0.574205935001373
2008	-0.559036314487457
2009	-0.562151730060577
2010	-0.633431315422058
2011	-0.619015693664551
2012	-0.458519369363785
2013	-0.404938369989395
2014	-0.23470650613308
2015	-0.315779864788055
2016	-0.224086627364159
2017	-0.240941062569618
2018	-0.15480200946331
2019	0.00728573789820075
2020	-0.133964225649834
2021	-0.258149892091751
2022	-0.57967621088028