-77.76% is the change from 661 to 147
Calculation steps:
[( 147 - 661 ) ÷ 661] x 100 = -77.76%
Formula
Percentage change = [(147 - 661) / 661] x 100
Subtract the new number by the original number
147 - 661 = -514
-514 ÷ 661 = -0.7776096822995462
-0.7776096822995462 x 100 = -77.76%