Year	Number
1996	-0.923635601997375
1998	-1.11976456642151
2000	-0.970691919326782
2002	-1.0197149515152
2003	-0.916132032871246
2004	-0.935620546340942
2005	-0.897212326526642
2006	-0.96748149394989
2007	-1.03206491470337
2008	-0.987497508525848
2009	-1.20047557353973
2010	-1.16522252559662
2011	-1.10223460197449
2012	-1.00097513198853
2013	-0.997697591781616
2014	-1.18909764289856
2015	-0.996232509613037
2016	-1.11994469165802
2017	-1.04142808914185
2018	-1.11822462081909
2019	-1.21332895755768
2020	-1.14423859119415
2021	-1.02781987190247
2022	-1.03512346744537