-2.16% is the change from 971 to 950
Calculation steps:
[( 950 - 971 ) ÷ 971] x 100 = -2.16%
Formula
Percentage change = [(950 - 971) / 971] x 100
Subtract the new number by the original number
950 - 971 = -21
-21 ÷ 971 = -0.021627188465499485
-0.021627188465499485 x 100 = -2.16%