Year	Number
1996	0.0132842948660254
1998	0.114651590585709
2000	-0.247218117117882
2002	-0.0449887700378895
2003	-0.121541075408459
2004	-0.244635745882988
2005	-0.363743484020233
2006	-0.253862708806992
2007	-0.161115884780884
2008	-0.222304701805115
2009	-0.250357389450073
2010	-0.231080830097198
2011	-0.293364822864532
2012	-0.29611411690712
2013	-0.252721816301346
2014	-0.202451646327972
2015	-0.211743652820587
2016	-0.247136488556862
2017	-0.172117531299591
2018	0.00112849986180663
2019	0.0320078320801258
2020	-0.0138225639238954
2021	0.100769482553005
2022	0.0259184092283249