Year	Number
1996	0.644922494888306
1998	0.65214592218399
2000	0.618822574615479
2002	0.568053841590881
2003	0.576729536056519
2004	0.54032027721405
2005	0.447557687759399
2006	0.407992005348206
2007	0.399155050516129
2008	0.498479098081589
2009	0.497974842786789
2010	0.487727552652359
2011	0.481366097927094
2012	0.48122963309288
2013	0.487086772918701
2014	-0.0703446120023727
2015	0.183694764971733
2016	0.218476206064224
2017	-0.0360001102089882
2018	-0.0534708015620708
2019	-0.0546945296227932
2020	-0.204486712813377
2021	-0.19328498840332
2022	-0.159468576312065