Year	Number
1996	-1.18347084522247
1998	-1.11872601509094
2000	-0.997799515724182
2002	-1.14361846446991
2003	-0.907567977905273
2004	-0.910640358924866
2005	-0.980864763259888
2006	-1.08017063140869
2007	-0.955795526504517
2008	-0.823480367660522
2009	-0.943409562110901
2010	-1.00942170619965
2011	-1.07831406593323
2012	-0.980967283248901
2013	-1.2608003616333
2014	-1.3894624710083
2015	-1.52139818668365
2016	-1.69688093662262
2017	-1.68153071403503
2018	-1.69031953811646
2019	-1.76251399517059
2020	-1.88033723831177
2021	-1.80397236347198
2022	-1.80244541168213