Year	Number
1996	0.505685269832611
1998	0.516642093658447
2000	0.496908664703369
2002	0.125430345535278
2003	-0.0485028326511383
2004	-0.148119673132896
2005	-0.318069249391556
2006	-0.345739334821701
2007	-0.411584377288818
2008	-0.358149886131287
2009	-0.473421841859818
2010	-0.550964772701263
2011	-0.641272008419037
2012	-0.778626441955566
2013	-0.909359693527222
2014	-0.885469436645508
2015	-1.33925545215607
2016	-1.34377884864807
2017	-1.23217439651489
2018	-1.32192349433899
2019	-1.4070611000061
2020	-1.33987975120544
2021	-1.25714194774628
2022	-1.282102227211