Year	Number
1996	0.386360377073288
1998	0.440841853618622
2000	0.416249960660934
2002	0.366997271776199
2003	0.276095181703568
2004	0.298770993947983
2005	0.209914743900299
2006	0.29562059044838
2007	0.34926038980484
2008	0.381994009017944
2009	0.328992426395416
2010	0.352258384227753
2011	0.355162888765335
2012	0.342293202877045
2013	0.333371847867966
2014	0.352297991514206
2015	0.337613850831985
2016	0.359746217727661
2017	0.351655811071396
2018	0.366042196750641
2019	0.359159141778946
2020	0.376031339168549
2021	0.379181206226349
2022	0.363235831260681