Year	Number
1996	-0.144020169973373
1998	-0.469900131225586
2000	-0.49317455291748
2002	-0.435577213764191
2003	-0.538822293281555
2004	-0.591962873935699
2005	-0.543785512447357
2006	-0.673949062824249
2007	-0.548251628875732
2008	-0.55720442533493
2009	-0.600310385227203
2010	-0.616408288478851
2011	-0.650063931941986
2012	-0.653231084346771
2013	-0.635170340538025
2014	-0.743758499622345
2015	-0.827747523784637
2016	-0.945310771465302
2017	-0.958367049694061
2018	-0.960750162601471
2019	-0.888383805751801
2020	-0.769691467285156
2021	-0.754338085651398
2022	-0.714270293712616