Shares Jak and Turner have the following historical returns
Year	Share Jak Returns (%)	Share Turner returns (%)
2016	-4	-3,5
2017	5	-4,8
2018	21,45	23,39
2019	41,63	47,78
2020	20,33	11,81
2021	36,33	33,9
2022	12	13
Required:
Calculate and explain which of the two shares had the most volatile returns over the seven year period