Year	Number
1996	-0.668952643871307
1998	-0.752315282821655
2000	-0.439044535160065
2002	-0.35481521487236
2003	-0.459642589092255
2004	-0.713360965251923
2005	-0.999740839004517
2006	-1.8038626909256
2007	-2.11909532546997
2008	-1.87660884857178
2009	-1.5616968870163
2010	-1.62501502037048
2011	-1.55828750133514
2012	-1.66481232643127
2013	-1.69035339355469
2014	-1.69794130325317
2015	-1.69836449623108
2016	-1.61568403244019
2017	-1.62222683429718
2018	-1.62153577804565
2019	-1.67229104042053
2020	-1.62113451957703
2021	-1.48194456100464
2022	-1.47351241111755