Year	Number
1996	-0.473676085472107
1998	-0.204747274518013
2000	-0.174759328365326
2002	-0.446098297834396
2003	-0.389788568019867
2004	-0.278711497783661
2005	-0.399056732654572
2006	-0.49823722243309
2007	-0.374726384878159
2008	-0.380703538656235
2009	-0.208088099956512
2010	-0.321309953927994
2011	-0.440889060497284
2012	-0.681878209114075
2013	-0.782055974006653
2014	-0.715836346149445
2015	-0.68997585773468
2016	-0.535138189792633
2017	-0.530270397663116
2018	-0.45396289229393
2019	-0.251194149255753
2020	-0.445820093154907
2021	-0.457345426082611
2022	-0.447546809911728