Year	Number
1996	0.110229268670082
1998	0.083308145403862
2000	0.186396479606628
2002	-0.208229526877403
2003	-0.384524792432785
2004	-0.34566855430603
2005	-0.298737347126007
2006	-0.320163667201996
2007	-0.256037086248398
2008	-0.307299733161926
2009	-0.363817691802979
2010	-0.4295414686203
2011	-0.0629833340644836
2012	0.12050811201334
2013	0.182374373078346
2014	0.0244925320148468
2015	0.0859657227993011
2016	0.295468419790268
2017	0.298302531242371
2018	0.423851728439331
2019	0.388235539197922
2020	0.258638471364975
2021	0.217914655804634
2022	0.379746347665787