Year	Number
1996	-0.964694976806641
1998	-0.76375538110733
2000	-0.965679228305817
2002	-1.0726033449173
2003	-1.0917055606842
2004	-1.12852549552917
2005	-1.03166806697845
2006	-1.18962633609772
2007	-1.16357934474945
2008	-1.09226036071777
2009	-1.07559907436371
2010	-1.13225626945496
2011	-1.12136948108673
2012	-1.17672073841095
2013	-1.24259889125824
2014	-1.18391644954681
2015	-1.16378211975098
2016	-1.20552575588226
2017	-1.24300539493561
2018	-1.20001685619354
2019	-1.23016166687012
2020	-1.18103766441345
2021	-1.13098561763763
2022	-1.06673884391785