Year	Number
1996	0.0523155070841312
1998	0.0505506321787834
2000	-0.181523725390434
2002	-0.260578572750092
2003	-0.425706028938293
2004	-0.47660157084465
2005	-0.534019768238068
2006	-0.53156977891922
2007	-0.51314514875412
2008	-0.530703067779541
2009	-0.65431421995163
2010	-0.673685908317566
2011	-0.658945083618164
2012	-0.574936270713806
2013	-0.567833364009857
2014	-0.485179126262665
2015	-0.554906368255615
2016	-0.625831365585327
2017	-0.644662261009216
2018	-0.691577911376953
2019	-0.677024126052856
2020	-0.764496326446533
2021	-0.629469573497772
2022	-0.602389514446259