Year	Number
1996	0.421715974807739
1998	0.381433337926865
2000	0.396205484867096
2002	0.392881572246552
2003	0.330509543418884
2004	0.316001296043396
2005	0.300349622964859
2006	0.273782998323441
2007	0.262691110372543
2008	0.263591170310974
2009	0.26473930478096
2010	0.260473906993866
2011	0.250866293907166
2012	0.221984326839447
2013	0.228019788861275
2014	0.196386188268661
2015	0.201144516468048
2016	0.206087306141853
2017	0.213935792446136
2018	0.212307974696159
2019	0.229520440101624
2020	0.232469826936722
2021	0.234690770506859
2022	0.233039766550064