Year	Number
1996	-0.300746202468872
1998	-0.112211242318153
2000	0.059820331633091
2002	-0.306921243667603
2003	0.0671200677752495
2004	-0.0812375172972679
2005	-0.0626529157161713
2006	0.155799552798271
2007	0.307008683681488
2008	0.118724599480629
2009	0.0340402871370316
2010	-0.117637142539024
2011	-0.55538147687912
2012	-0.573129236698151
2013	-0.763390123844147
2014	-0.787128567695618
2015	-0.609127342700958
2016	-0.868710696697235
2017	-0.927885591983795
2018	-1.06025648117065
2019	-1.30215322971344
2020	-1.53794133663177
2021	-1.64286971092224
2022	-1.7825174331665