-90.31% is the change from 671 to 65
Calculation steps:
[( 65 - 671 ) ÷ 671] x 100 = -90.31%
Formula
Percentage change = [(65 - 671) / 671] x 100
Subtract the new number by the original number
65 - 671 = -606
-606 ÷ 671 = -0.9031296572280179
-0.9031296572280179 x 100 = -90.31%