Year	Number
2004	0.319958239793777
2005	0.203041076660156
2006	0.266264259815216
2007	0.279377818107605
2008	0.231026411056519
2009	0.216449201107025
2010	0.208097830414772
2011	0.211273431777954
2012	0.230768129229546
2013	0.238375931978226
2014	0.285645455121994
2015	0.25964167714119
2016	0.275300115346909
2017	0.27390918135643
2018	0.279756247997284
2019	0.286051064729691
2020	0.311413139104843
2021	0.325010359287262
2022	0.30890029668808