Year	Number
1996	-0.381090342998505
1998	-0.258726745843887
2000	-0.403301805257797
2002	-0.555382490158081
2003	-0.456320524215698
2004	-0.448476195335388
2005	-0.363160848617554
2006	-0.274562805891037
2007	-0.397690296173096
2008	-0.33909797668457
2009	-0.452406287193298
2010	-0.463754564523697
2011	-0.540835857391357
2012	-0.513968110084534
2013	-0.517085731029511
2014	-0.457155108451843
2015	-0.406170606613159
2016	-0.336941868066788
2017	-0.291451543569565
2018	-0.229412421584129
2019	-0.302205294370651
2020	-0.292916029691696
2021	-0.316493511199951
2022	-0.321810871362686