-95.36% is the change from 646 to 30
Calculation steps:
[( 30 - 646 ) ÷ 646] x 100 = -95.36%
Formula
Percentage change = [(30 - 646) / 646] x 100
Subtract the new number by the original number
30 - 646 = -616
-616 ÷ 646 = -0.9535603715170279
-0.9535603715170279 x 100 = -95.36%