Year	Number
1996	-1.52726411819458
1998	-0.982505977153778
2000	-1.04017269611359
2002	-1.2641419172287
2003	-0.65076744556427
2004	-0.459568113088608
2005	-0.212853789329529
2006	0.0501524582505226
2007	-0.128835424780846
2008	-0.102076381444931
2009	-0.122036166489124
2010	0.0123015772551298
2011	0.117519699037075
2012	0.39742112159729
2013	0.463925153017044
2014	0.828557550907135
2015	0.700715780258179
2016	0.712996661663055
2017	0.758942425251007
2018	0.724707186222076
2019	0.716376483440399
2020	0.600856006145477
2021	0.661190092563629
2022	0.620237648487091