Year	Number
1996	-0.401735693216324
1998	-0.452446401119232
2000	-0.656351625919342
2002	-0.590202867984772
2003	-0.414270848035812
2004	-0.52077054977417
2005	-0.530171871185303
2006	-0.523552715778351
2007	-0.580034494400024
2008	-0.646401107311249
2009	-0.722060024738312
2010	-0.761707723140717
2011	-0.734936654567719
2012	-0.805144667625427
2013	-0.858153939247131
2014	-0.847787737846375
2015	-0.831647515296936
2016	-0.789327502250671
2017	-0.740814745426178
2018	-0.775707900524139
2019	-0.735730886459351
2020	-0.735240161418915
2021	-0.642471373081207
2022	-0.650234937667847