-91.14% is the change from 666 to 59
Calculation steps:
[( 59 - 666 ) ÷ 666] x 100 = -91.14%
Formula
Percentage change = [(59 - 666) / 666] x 100
Subtract the new number by the original number
59 - 666 = -607
-607 ÷ 666 = -0.9114114114114115
-0.9114114114114115 x 100 = -91.14%