Year	Number
1996	-0.48242661356926
1998	-0.402721375226974
2000	-0.345562547445297
2002	-0.67900162935257
2003	-0.636823534965515
2004	-0.604071080684662
2005	-0.317553699016571
2006	-0.518898844718933
2007	-0.490206182003021
2008	-0.464453905820847
2009	-0.531529664993286
2010	-0.581304907798767
2011	-0.541880786418915
2012	-0.55492377281189
2013	-0.515489280223846
2014	-0.360538631677628
2015	-0.356080949306488
2016	0.0651851072907448
2017	0.0404918380081654
2018	-0.0353447571396828
2019	-0.0502180941402912
2020	-0.188712939620018
2021	-0.171954914927483
2022	-0.158443406224251