Year	Number
1996	-0.442145347595215
1998	-0.395977348089218
2000	-0.420464307069778
2002	-0.660840332508087
2003	-0.61183363199234
2004	-0.4958216547966
2005	-0.492080003023148
2006	-0.407301127910614
2007	-0.457430690526962
2008	-0.543911099433899
2009	-0.470705568790436
2010	-0.46234917640686
2011	-0.449195504188538
2012	-0.410142123699188
2013	-0.353273868560791
2014	-0.363270282745361
2015	-0.427903473377228
2016	-0.483072638511658
2017	-0.610303103923798
2018	-0.640993356704712
2019	-0.668204069137573
2020	-0.68933516740799
2021	-0.640137732028961
2022	-0.563533365726471