Year	Number
1996	-0.722833931446075
1998	-0.689512550830841
2000	-0.696313202381134
2002	-0.673779785633087
2003	-0.86640602350235
2004	-1.14759469032288
2005	-1.31761395931244
2006	-1.33152568340302
2007	-1.28131055831909
2008	-1.20606291294098
2009	-1.24884247779846
2010	-1.19573104381561
2011	-1.19296872615814
2012	-1.02507245540619
2013	-0.940360546112061
2014	-0.853411793708801
2015	-0.944022536277771
2016	-0.986315608024597
2017	-0.9670649766922
2018	-0.997076809406281
2019	-1.07636892795563
2020	-1.08248507976532
2021	-1.0548460483551
2022	-0.96577912569046