Year	Number
1996	-0.54373174905777
1998	-0.683049440383911
2000	-1.30195045471191
2002	-1.0568835735321
2003	-1.29919517040253
2004	-1.45551669597626
2005	-1.95789563655853
2006	-1.78465950489044
2007	-1.36203336715698
2008	-1.20710647106171
2009	-0.950552523136139
2010	-0.720438122749329
2011	-0.599719345569611
2012	-0.518739342689514
2013	-0.536078989505768
2014	-0.273108631372452
2015	-0.374532461166382
2016	-0.280753701925278
2017	-0.244979038834572
2018	-0.304469525814056
2019	-0.296665459871292
2020	-0.436710476875305
2021	-0.252974152565002
2022	-0.196214869618416