Year	Number
2013	15.105687461067186
2014	17.16949357341079
2015	19.090762259806944
2016	19.914018921891024
2017	18.866157431244215
2018	12.924035330861425
2019	12.201006724641653
2020	17.153587641236463
2021	14.087926841541814
2022	11.03039337725002
2023	8.935113721026724