Year	Number
1996	-0.439127802848816
1998	-0.600993573665619
2000	-0.709425866603851
2002	-0.881512939929962
2003	-0.778926432132721
2004	-0.884178817272186
2005	-0.835764110088348
2006	-0.773362696170807
2007	-0.675990700721741
2008	-0.725814461708069
2009	-0.641269385814667
2010	-0.61578905582428
2011	-0.843221604824066
2012	-0.698649287223816
2013	-0.738603949546814
2014	-0.909684360027313
2015	-1.15677309036255
2016	-1.49802947044373
2017	-1.48944044113159
2018	-1.63697516918182
2019	-1.70266783237457
2020	-1.85752165317535
2021	-2.04068326950073
2022	-1.91754972934723