Year	Number
1996	-0.374195218086243
1998	-0.364895522594452
2000	-0.377791106700897
2002	-0.233312800526619
2003	-0.176545038819313
2004	-0.522410035133362
2005	-0.694694995880127
2006	-0.729944288730621
2007	-0.712738215923309
2008	-0.714707136154175
2009	-0.557290554046631
2010	-0.587572574615479
2011	-0.513804793357849
2012	-0.653231739997864
2013	-0.706011950969696
2014	-0.693982779979706
2015	-0.813672840595245
2016	-0.850145161151886
2017	-0.657365679740906
2018	-0.501664221286774
2019	-0.40828874707222
2020	-0.425882965326309
2021	-0.382034093141556
2022	-0.278427481651306