-76.75% is the change from 671 to 156
Calculation steps:
[( 156 - 671 ) ÷ 671] x 100 = -76.75%
Formula
Percentage change = [(156 - 671) / 671] x 100
Subtract the new number by the original number
156 - 671 = -515
-515 ÷ 671 = -0.767511177347243
-0.767511177347243 x 100 = -76.75%