Year	Number
2008	0.660762906074524
2009	0.664816915988922
2010	0.376329958438873
2011	0.345713257789612
2012	0.353697180747986
2013	0.330618232488632
2014	0.218982502818108
2015	0.223781511187553
2016	0.228173807263374
2017	0.237186849117279
2018	0.234690293669701
2019	0.250075668096542
2020	0.247393816709518
2021	0.24306446313858
2022	0.240944445133209