Year	Number
1996	-0.75183779001236
1998	-0.662920475006104
2000	-0.925037920475006
2002	-0.749073088169098
2003	-0.739117562770844
2004	-0.695200145244598
2005	-0.63308185338974
2006	-0.508387923240662
2007	-0.432980388402939
2008	-0.381235986948013
2009	-0.367777585983276
2010	-0.271385610103607
2011	-0.217361465096474
2012	-0.32591912150383
2013	-0.387949466705322
2014	-0.251975983381271
2015	-0.246754705905914
2016	-0.265702873468399
2017	-0.366342157125473
2018	-0.383665770292282
2019	-0.391018122434616
2020	-0.492650598287582
2021	-0.469918787479401
2022	-0.426875531673431