Year	Number
1996	-0.0711131766438484
1998	-0.730146408081055
2000	-1.16382563114166
2002	-1.71746289730072
2003	-1.89185237884521
2004	-2.14913845062256
2005	-2.09840488433838
2006	-1.89445018768311
2007	-1.88537847995758
2008	-1.83428740501404
2009	-1.62008118629456
2010	-1.58397114276886
2011	-1.41644358634949
2012	-1.38123226165771
2013	-1.12914609909058
2014	-0.724599540233612
2015	-0.997430026531219
2016	-0.846989989280701
2017	-0.58410120010376
2018	-0.542416572570801
2019	-0.452942907810211
2020	-0.180229142308235
2021	-0.188807815313339
2022	-0.251907497644424