Year	Number
1996	0.135673850774765
1998	0.335129141807556
2000	0.0691719427704811
2002	-0.0784095153212547
2003	-0.058016262948513
2004	-0.430164128541946
2005	-0.0601043850183487
2006	-0.301130533218384
2007	-0.382520467042923
2008	-0.560679852962494
2009	-0.477560758590698
2010	-0.435533314943314
2011	-0.456474870443344
2012	-0.532351732254028
2013	-0.614103138446808
2014	-0.69313257932663
2015	-0.732971966266632
2016	-0.717620611190796
2017	-0.71371054649353
2018	-0.889868915081024
2019	-0.958428800106049
2020	-0.881805598735809
2021	-0.821126997470856
2022	-0.702257215976715