Year	Number
1996	0.425557196140289
1998	0.421897411346436
2000	0.341131985187531
2002	0.359068334102631
2003	0.337395370006561
2004	0.280416071414948
2005	0.378238171339035
2006	0.259322911500931
2007	0.191248714923859
2008	0.127722352743149
2009	0.157519295811653
2010	0.118389397859573
2011	0.172344386577606
2012	0.186642453074455
2013	0.199680164456367
2014	-0.137727960944176
2015	0.17503060400486
2016	0.618741393089294
2017	0.461015522480011
2018	0.249573826789856
2019	0.187111258506775
2020	0.326836466789246
2021	0.489527076482773
2022	0.554005026817322