Year	Number
1996	-0.378730356693268
1998	-0.036602433770895
2000	-0.0521482117474079
2002	-0.179417580366135
2003	-0.0229330193251371
2004	-0.0404722616076469
2005	-0.500283241271973
2006	-0.292215287685394
2007	-0.0135454647243023
2008	-0.177931427955627
2009	-0.181886002421379
2010	-0.122200235724449
2011	-0.0821348130702972
2012	-0.100731432437897
2013	-0.102658443152905
2014	-0.222039371728897
2015	-0.33048290014267
2016	-0.283952057361603
2017	-0.280504614114761
2018	-0.254933685064316
2019	-0.39551830291748
2020	-0.446153789758682
2021	-0.261376172304153
2022	-0.265898406505585