Year	Number
2002	11.620651387227193
2003	10.833629689308125
2004	9.954754409309732
2005	10.625122287708848
2006	11.536633814623647
2007	10.377689896223735
2008	10.845026252208335
2009	14.81081035181897
2010	16.585742886706065
2011	17.458539233928242
2012	18.581168272587323
2013	16.159959972918614
2014	16.759154046476347
2015	17.24494882994527
2016	18.873387694358424
2017	18.77984661349139
2018	17.12220889746295
2019	17.653893850484163
2020	28.56718541257819
2021	21.56172653048018
2022	14.902911589004086