Year	Number
1996	-0.687850117683411
1998	-0.490328997373581
2000	-0.492341905832291
2002	-0.48123624920845
2003	-0.452729970216751
2004	-0.471558660268784
2005	-0.572079658508301
2006	-0.581117987632751
2007	-0.451820909976959
2008	-0.620234608650208
2009	-0.670799374580383
2010	-0.572281301021576
2011	-0.559457004070282
2012	-0.5962153673172
2013	-0.611192941665649
2014	-0.539801716804504
2015	-0.575034499168396
2016	-0.631866991519928
2017	-0.632896423339844
2018	-0.692178010940552
2019	-0.648771643638611
2020	-0.616316556930542
2021	-0.600183427333832
2022	-0.583969175815582