Year	Number
1996	-0.124192699790001
1998	-0.0990643203258514
2000	-0.14284160733223
2002	0.0323283895850182
2003	0.0484472848474979
2004	-0.511713027954102
2005	-0.171274870634079
2006	-0.529533982276917
2007	-0.465739756822586
2008	-0.463723570108414
2009	-0.396679133176804
2010	-0.396515280008316
2011	-0.37685090303421
2012	-0.426588296890259
2013	-0.457035183906555
2014	-0.595190942287445
2015	-0.757278263568878
2016	-0.878006041049957
2017	-0.925521492958069
2018	-0.922438740730286
2019	-0.902621507644653
2020	-0.979480028152466
2021	-0.948357462882996
2022	-0.890573918819427