Year	Number
1996	-0.176318302750587
1998	-0.145220279693604
2000	-0.160908803343773
2002	-0.573989808559418
2003	-0.621432840824127
2004	-0.619886994361877
2005	-0.641528606414795
2006	-0.461876183748245
2007	-0.506433963775635
2008	-0.554605662822723
2009	-0.398531436920166
2010	-0.40174999833107
2011	-0.401879459619522
2012	-0.40126171708107
2013	-0.415549963712692
2014	-0.620842099189758
2015	-0.621767401695251
2016	-0.583056390285492
2017	-0.523228943347931
2018	-0.393426120281219
2019	-0.446330428123474
2020	-0.483431756496429
2021	-0.447988480329514
2022	-0.348364651203156