Year	Number
1996	-0.480606764554977
1998	-0.460588485002518
2000	-0.40113028883934
2002	-0.218060061335564
2003	-0.311086535453796
2004	-0.359162539243698
2005	-0.477626025676727
2006	-0.484105497598648
2007	-0.556039273738861
2008	-0.755060851573944
2009	-0.767309308052063
2010	-0.948633968830109
2011	-0.880579233169556
2012	-0.797346830368042
2013	-0.693658530712128
2014	-0.625268459320068
2015	-0.633904039859772
2016	-0.739656686782837
2017	-0.838275671005249
2018	-0.984159290790558
2019	-1.07132577896118
2020	-1.11073660850525
2021	-1.11569344997406
2022	-1.12637281417847