Year	Number
1996	-1.01984238624573
1998	-0.98831170797348
2000	-0.967182695865631
2002	-0.990784227848053
2003	-0.989836037158966
2004	-1.05834627151489
2005	-1.22373998165131
2006	-1.26038551330566
2007	-1.15168952941895
2008	-1.24171054363251
2009	-1.18124008178711
2010	-1.24900782108307
2011	-1.25564956665039
2012	-1.08068156242371
2013	-1.0637218952179
2014	-1.14674997329712
2015	-1.15312373638153
2016	-1.30133092403412
2017	-1.31736183166504
2018	-1.35679519176483
2019	-1.32316565513611
2020	-1.27112245559692
2021	-1.19748938083649
2022	-1.24149858951569