Year	Number
1996	-1.50618171691895
1998	-1.29401504993439
2000	-0.119894370436668
2002	-0.204168319702148
2003	-0.156030610203743
2004	-0.190244764089584
2005	-0.283560395240784
2006	-0.324552685022354
2007	-0.368081420660019
2008	-0.441894054412842
2009	-0.737894237041473
2010	-0.666964292526245
2011	-0.246729359030724
2012	-0.284627556800842
2013	-0.30628964304924
2014	-0.194567888975143
2015	-0.204202279448509
2016	-0.421779066324234
2017	-0.430217504501343
2018	-0.598497688770294
2019	-0.581456243991852
2020	-0.493436366319656
2021	-0.392590999603271
2022	-0.381765067577362