Year	Number
1996	0.0533696189522743
1998	0.103398241102695
2000	-0.12550862133503
2002	-0.0547769628465176
2003	0.1581120043993
2004	-0.0153151294216514
2005	-0.24899522960186
2006	-0.194359108805656
2007	-0.217171907424927
2008	-0.367741048336029
2009	-0.439285933971405
2010	-0.477622449398041
2011	-0.576730072498322
2012	-0.536340475082397
2013	-0.457648277282715
2014	-0.395715713500977
2015	-0.41474524140358
2016	-0.680031597614288
2017	-0.71773087978363
2018	-1.09969997406006
2019	-1.0979665517807
2020	-1.09754991531372
2021	-1.2854220867157
2022	-1.34889101982117