-77.5% is the change from 671 to 151
Calculation steps:
[( 151 - 671 ) ÷ 671] x 100 = -77.5%
Formula
Percentage change = [(151 - 671) / 671] x 100
Subtract the new number by the original number
151 - 671 = -520
-520 ÷ 671 = -0.7749627421758569
-0.7749627421758569 x 100 = -77.5%