-84.17% is the change from 417 to 66
Calculation steps:
[( 66 - 417 ) ÷ 417] x 100 = -84.17%
Formula
Percentage change = [(66 - 417) / 417] x 100
Subtract the new number by the original number
66 - 417 = -351
-351 ÷ 417 = -0.841726618705036
-0.841726618705036 x 100 = -84.17%