Year	Number
1996	-0.566740930080414
1998	-0.916649281978607
2000	-0.987298190593719
2002	-0.928754985332489
2003	-0.715244472026825
2004	-0.699272692203522
2005	-0.466420471668243
2006	-0.564962565898895
2007	-0.592309474945068
2008	-0.633444845676422
2009	-0.614938259124756
2010	-0.552147269248962
2011	-0.572699666023254
2012	-0.521544516086578
2013	-0.472622781991959
2014	-0.61265641450882
2015	-0.639073312282562
2016	-0.67341673374176
2017	-0.598509311676025
2018	-0.658660113811493
2019	-0.655895113945007
2020	-0.66646021604538
2021	-0.635657608509064
2022	-0.637929856777191