Year	Number
1996	0.13993801176548
1998	0.224192708730698
2000	0.00215644319541752
2002	-0.0776224359869957
2003	-0.0183236226439476
2004	0.125264555215836
2005	-0.170190066099167
2006	0.189769744873047
2007	0.322974681854248
2008	0.314200758934021
2009	0.276933073997498
2010	0.297299355268478
2011	0.291849315166473
2012	0.0459933318197727
2013	0.0749636813998222
2014	0.203010261058807
2015	0.294767826795578
2016	0.4741171002388
2017	0.552543342113495
2018	0.595471441745758
2019	0.589010059833527
2020	0.528976261615753
2021	0.378315657377243
2022	0.604482173919678