Year	Number
1996	-2.11674880981445
1998	-1.84154975414276
2000	-1.64776349067688
2002	-0.982307970523834
2003	-1.09949171543121
2004	-1.30745339393616
2005	-1.39246213436127
2006	-1.3861448764801
2007	-0.752052187919617
2008	-0.830599308013916
2009	-1.02539455890656
2010	-1.03453838825226
2011	-1.02323389053345
2012	-1.24085974693298
2013	-1.18237400054932
2014	-0.69334077835083
2015	-0.882318019866943
2016	-0.78061830997467
2017	-0.674310863018036
2018	-0.74773895740509
2019	-0.512072920799255
2020	-0.500084042549133
2021	-0.676817953586578
2022	-0.694840013980865