-97.79% is the change from 950 to 21
Calculation steps:
[( 21 - 950 ) ÷ 950] x 100 = -97.79%
Formula
Percentage change = [(21 - 950) / 950] x 100
Subtract the new number by the original number
21 - 950 = -929
-929 ÷ 950 = -0.9778947368421053
-0.9778947368421053 x 100 = -97.79%