Year	Number
1996	0.17475751042366
1998	0.132018834352493
2000	0.459468245506287
2002	0.438226073980331
2003	-0.047485888004303
2004	-0.0905463024973869
2005	0.19302661716938
2006	-0.150648653507233
2007	-0.276731640100479
2008	-0.383085459470749
2009	-0.474599570035934
2010	-0.318043738603592
2011	0.0211045369505882
2012	-0.0295164491981268
2013	0.0120177594944835
2014	0.243121743202209
2015	0.24116013944149
2016	0.402214497327805
2017	0.270845115184784
2018	0.275779157876968
2019	0.292700946331024
2020	0.411397874355316
2021	0.509131908416748
2022	0.265326976776123