Year	Number
1996	0.0334169194102287
1998	-0.203814625740051
2000	-1.24080407619476
2002	-1.91973388195038
2003	-1.80326271057129
2004	-2.11492109298706
2005	-2.25952887535095
2006	-1.86186838150024
2007	-1.83957278728485
2008	-1.80406737327576
2009	-1.32086253166199
2010	-1.5838942527771
2011	-1.40580761432648
2012	-1.26346111297607
2013	-1.04872417449951
2014	-1.03716063499451
2015	-0.835078060626984
2016	-0.909238815307617
2017	-1.0911158323288
2018	-0.898008048534393
2019	-1.03647410869598
2020	-1.03320527076721
2021	-0.715018510818481
2022	-0.51637864112854