Year	Number
1996	-1.14093124866486
1998	-1.12268388271332
2000	-1.19889616966248
2002	-0.979822814464569
2003	-1.02073454856873
2004	-1.47727310657501
2005	-1.30276608467102
2006	-1.21914231777191
2007	-1.21095335483551
2008	-1.13727676868439
2009	-0.988850176334381
2010	-0.937605500221252
2011	-0.967538118362427
2012	-1.0055319070816
2013	-1.09623372554779
2014	-1.16635048389435
2015	-1.32688450813293
2016	-1.30534648895264
2017	-1.20007252693176
2018	-1.23319137096405
2019	-1.23396146297455
2020	-1.2947770357132
2021	-1.24628365039825
2022	-1.24606657028198