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	36.00	33.90
2022	12	13
Required: Calculate and explain which of the two shares had the most volatile returns over the seven -year period.