Year	Number
1996	-0.140642017126083
1998	-0.352434873580933
2000	-0.42087984085083
2002	-0.261595070362091
2003	-0.357633143663406
2004	-0.400268286466599
2005	-0.558261573314667
2006	-0.583094894886017
2007	-0.592017114162445
2008	-0.556314647197723
2009	-0.539242208003998
2010	-0.562469244003296
2011	-0.619942247867584
2012	-0.761781573295593
2013	-0.651674628257751
2014	-0.740717887878418
2015	-0.657496333122253
2016	-0.347629547119141
2017	-0.531385481357574
2018	-0.249941125512123
2019	-0.142822340130806
2020	-0.173361897468567
2021	-0.187444075942039
2022	-0.295775651931763