Year	Number
1996	-1.18900859355927
1998	-1.16061270236969
2000	-1.32463443279266
2002	-1.50206756591797
2003	-1.41765379905701
2004	-1.38337290287018
2005	-1.18077552318573
2006	-1.12639439105988
2007	-1.06693983078003
2008	-0.900948941707611
2009	-1.04188585281372
2010	-1.05150854587555
2011	-1.18936145305634
2012	-1.17593324184418
2013	-1.22686922550201
2014	-1.28350389003754
2015	-1.09567785263062
2016	-1.04513537883759
2017	-1.09980297088623
2018	-1.08356761932373
2019	-1.11513042449951
2020	-1.1208575963974
2021	-1.1032567024231
2022	-1.10103046894073