Year	Number
1996	0.83064466714859
1998	0.838597416877747
2000	0.309305250644684
2002	0.743997812271118
2003	0.578085064888
2004	0.153857663273811
2005	0.363082945346832
2006	0.354031831026077
2007	0.682846009731293
2008	0.911096274852753
2009	0.938135385513306
2010	1.01733005046844
2011	1.07206296920776
2012	1.04947865009308
2013	0.973354995250702
2014	0.842940807342529
2015	0.862319052219391
2016	0.496157646179199
2017	0.50975513458252
2018	0.480340898036957
2019	0.550631165504456
2020	0.49156528711319
2021	0.4918013215065
2022	0.500283241271973