Year	Number
2011	0.473933637142181
2012	2.36966824531555
2013	1.42180097103119
2014	1.92307686805725
2015	1.90476191043854
2016	0.952380955219269
2017	0
2018	0.476190477609634
2019	0.476190477609634
2020	0
2021	0
2022	0