Year	Number
1996	-0.29691082239151
1998	-0.227835923433304
2000	-0.241970613598824
2002	-0.264004319906235
2003	0.0300825759768486
2004	-0.194137424230576
2005	-0.140042945742607
2006	-0.28743439912796
2007	-0.182401552796364
2008	-0.319483637809753
2009	-0.36310139298439
2010	-0.447257936000824
2011	-0.500218212604523
2012	-0.664888739585876
2013	-0.747100412845612
2014	-0.635085225105286
2015	-0.751449584960938
2016	-0.79881340265274
2017	-0.793805599212646
2018	-0.815356373786926
2019	-0.864916384220123
2020	-0.950111389160156
2021	-0.919275939464569
2022	-0.999322295188904