Year	Number
1996	-0.580390334129334
1998	-0.646357476711273
2000	-0.866051256656647
2002	-0.697901129722595
2003	-0.540637612342834
2004	-0.693985939025879
2005	-0.542147874832153
2006	-0.325426667928696
2007	-0.357663184404373
2008	-0.344882220029831
2009	-0.411506861448288
2010	-0.396869570016861
2011	-0.359688609838486
2012	-0.356279820203781
2013	-0.346435457468033
2014	-0.394620954990387
2015	-0.414675444364548
2016	-0.270433574914932
2017	-0.319819033145905
2018	-0.321435153484344
2019	-0.344945698976517
2020	-0.347207844257355
2021	-0.367464244365692
2022	-0.383247643709183