Year	Number
1996	-0.203850328922272
1998	-0.367153853178024
2000	-0.423614680767059
2002	-0.517882883548737
2003	-0.575900852680206
2004	-0.619943141937256
2005	-0.663847804069519
2006	-0.564467251300812
2007	-0.4570552110672
2008	-0.580651640892029
2009	-0.555844962596893
2010	-0.477120876312256
2011	-0.510029077529907
2012	-0.518265724182129
2013	-0.524389088153839
2014	-0.614730000495911
2015	-0.541154861450195
2016	-0.31358602643013
2017	-0.29889103770256
2018	-0.383601844310761
2019	-0.445426762104034
2020	-0.434385359287262
2021	-0.416192442178726
2022	-0.313648909330368