Year	Number
2004	0.140641778707504
2005	1.23957788944244
2006	0.905649721622467
2007	0.719497740268707
2008	0.434909999370575
2009	0.49756196141243
2010	0.321675181388855
2011	0.351851403713226
2012	0.342154562473297
2013	0.321960687637329
2014	0.357046246528625
2015	0.275838017463684
2016	0.259495288133621
2017	0.263444691896439
2018	0.304560840129852
2019	0.274758160114288
2020	0.345437973737717
2021	0.343585729598999
2022	0.348867624998093