Year	Number
1996	-0.862947106361389
1998	-0.933741688728333
2000	-0.642675042152405
2002	-1.06142449378967
2003	-1.06747889518738
2004	-0.978202819824219
2005	-1.03074622154236
2006	-1.04962706565857
2007	-1.08307754993439
2008	-1.14442372322083
2009	-1.17169654369354
2010	-1.2080090045929
2011	-1.1550704240799
2012	-1.25829756259918
2013	-1.30656266212463
2014	-1.39455723762512
2015	-1.40704655647278
2016	-1.3659108877182
2017	-1.38497376441956
2018	-1.51203751564026
2019	-1.52759885787964
2020	-1.57601821422577
2021	-1.62249159812927
2022	-1.6511367559433