Year	Number
1996	-0.881176233291626
1998	-0.914689540863037
2000	-1.00953269004822
2002	-0.39979687333107
2003	-0.801886260509491
2004	-0.829437732696533
2005	-0.852751672267914
2006	-0.949827790260315
2007	-1.00992751121521
2008	-1.07074987888336
2009	-1.05090487003326
2010	-1.10248649120331
2011	-1.10073792934418
2012	-1.21936678886414
2013	-1.26526856422424
2014	-1.56001710891724
2015	-1.56881427764893
2016	-1.59281694889069
2017	-1.58310747146606
2018	-1.64808285236359
2019	-1.70775437355042
2020	-1.73549365997314
2021	-1.7984002828598
2022	-1.77599906921387