-80% is the change from 665 to 133
Calculation steps:
[( 133 - 665 ) ÷ 665] x 100 = -80%
Formula
Percentage change = [(133 - 665) / 665] x 100
Subtract the new number by the original number
133 - 665 = -532
-532 ÷ 665 = -0.8
-0.8 x 100 = -80%
Example