Year	Number
1996	0.340782076120377
1998	0.361922770738602
2000	0.177562460303307
2002	0.182450026273727
2003	0.214311689138412
2004	-0.0656907260417938
2005	0.0877809450030327
2006	-0.202771097421646
2007	-0.37489053606987
2008	-0.354255259037018
2009	-0.281599670648575
2010	-0.339228063821793
2011	-0.346251636743546
2012	-0.357465267181396
2013	-0.400275111198425
2014	-0.266557604074478
2015	-0.345678001642227
2016	-0.35593655705452
2017	0.0952409654855728
2018	-0.0343346484005451
2019	-0.0503519363701344
2020	0.0699475035071373
2021	-0.163580566644669
2022	-0.184422299265862