-77.12% is the change from 660 to 151
Calculation steps:
[( 151 - 660 ) ÷ 660] x 100 = -77.12%
Formula
Percentage change = [(151 - 660) / 660] x 100
Subtract the new number by the original number
151 - 660 = -509
-509 ÷ 660 = -0.7712121212121212
-0.7712121212121212 x 100 = -77.12%