Year	Number
1996	-0.543357133865356
1998	-0.531463503837585
2000	-0.579191446304321
2002	-0.677856028079987
2003	-0.575908243656158
2004	-0.650516927242279
2005	-0.520047545433044
2006	-0.525552690029144
2007	-0.593855679035187
2008	-0.541388154029846
2009	-0.612616002559662
2010	-0.667498528957367
2011	-0.582489609718323
2012	-0.476160943508148
2013	-0.446002990007401
2014	-0.634206414222717
2015	-0.631722152233124
2016	-0.642956674098969
2017	-0.556830585002899
2018	-0.668974459171295
2019	-0.701412081718445
2020	-0.795015275478363
2021	-0.721502065658569
2022	-0.789872884750366