Year	Number
1996	-0.358871847391129
1998	-0.38195013999939
2000	-0.527593672275543
2002	-0.538531899452209
2003	-0.635371625423431
2004	-0.707702457904816
2005	-0.662843585014343
2006	-0.889426827430725
2007	-0.778005182743073
2008	-0.778095126152039
2009	-0.786739230155945
2010	-0.781123995780945
2011	-0.685034811496735
2012	-0.573895454406738
2013	-0.379904359579086
2014	-0.439453065395355
2015	-0.480595767498016
2016	-0.518573582172394
2017	-0.507046699523926
2018	-0.576285362243652
2019	-0.605999052524567
2020	-0.510496735572815
2021	-0.529578149318695
2022	-0.540948450565338