Year	Number
1996	-0.093646302819252
1998	0.114986144006252
2000	-0.0687929019331932
2002	-0.462428361177444
2003	-0.439825713634491
2004	-0.598475635051727
2005	-0.637349963188171
2006	-0.622201085090637
2007	-0.745731115341187
2008	-0.752219378948212
2009	-0.853539109230042
2010	-0.870534300804138
2011	-0.934033572673798
2012	-0.906963706016541
2013	-0.951577425003052
2014	-1.08375942707062
2015	-1.09107983112335
2016	-1.13542306423187
2017	-1.21653747558594
2018	-1.43899095058441
2019	-1.43031644821167
2020	-1.51525104045868
2021	-1.61752390861511
2022	-1.53392553329468