Year	Number
2004	0.376263976097107
2005	0.2796431183815
2006	0.355723708868027
2007	0.361441880464554
2008	0.357565850019455
2009	0.34416800737381
2010	0.345248699188232
2011	0.34813866019249
2012	0.308943897485733
2013	0.303200900554657
2014	0.318150222301483
2015	0.340214461088181
2016	0.3360835313797
2017	0.392407566308975
2018	0.388508200645447
2019	0.394042789936066
2020	0.433770954608917
2021	0.423158824443817
2022	0.415553271770477