-95.46% is the change from 661 to 30
Calculation steps:
[( 30 - 661 ) ÷ 661] x 100 = -95.46%
Formula
Percentage change = [(30 - 661) / 661] x 100
Subtract the new number by the original number
30 - 661 = -631
-631 ÷ 661 = -0.9546142208774584
-0.9546142208774584 x 100 = -95.46%