Year	Number
2010	5.696362253109193
2011	3.8301526145503946
2012	2.2741521425786706
2013	2.973771333538931
2014	3.9693845717770055
2015	3.575986825542898
2016	3.598028792686059
2017	4.1817452104956825
2018	4.3884746560656005
2019	4.304769831703187
2020	5.446667634303171
2021	5.469746956164999
2022	3.9347896366819772
2023	3.6010946034286917