Year	Number
1996	-1.41534507274628
1998	-1.44526171684265
2000	-1.50704801082611
2002	-1.29413509368896
2003	-1.18746745586395
2004	-1.22671353816986
2005	-1.24003624916077
2006	-1.15621566772461
2007	-1.07531261444092
2008	-1.10149598121643
2009	-1.05952525138855
2010	-1.06021749973297
2011	-1.10753154754639
2012	-0.990437567234039
2013	-1.0416704416275
2014	-0.860683441162109
2015	-0.8636714220047
2016	-0.969250917434692
2017	-1.04509711265564
2018	-0.8006831407547
2019	-0.833844542503357
2020	-0.856853485107422
2021	-0.670014679431915
2022	-0.606698572635651