Year	Number
2004	0.915526807308197
2005	0.847438395023346
2006	0.810431301593781
2007	0.826464056968689
2008	0.847226142883301
2009	1.42620670795441
2010	1.41611361503601
2011	1.3224583864212
2012	1.30978834629059
2013	1.29250478744507
2014	1.03631043434143
2015	1.22662305831909
2016	1.22644209861755
2017	1.29483151435852
2018	1.2594119310379
2019	1.22776162624359
2020	1.27026236057281
2021	1.24730372428894
2022	1.27890753746033