Year	Number
1996	0.273877173662186
1998	0.412275731563568
2000	0.153456091880798
2002	-0.0942921563982964
2003	-0.250032126903534
2004	-0.0683272704482079
2005	-0.121956370770931
2006	-0.237762182950974
2007	-0.188574343919754
2008	-0.117300540208817
2009	-0.14176744222641
2010	-0.0508231818675995
2011	0.141080409288406
2012	0.104277603328228
2013	0.0936860963702202
2014	0.247864335775375
2015	0.279361039400101
2016	0.277257770299912
2017	0.269298404455185
2018	0.230616614222527
2019	0.081537127494812
2020	0.110377036035061
2021	0.239029332995415
2022	0.357974648475647