-13.59% is the change from 949 to 820
Calculation steps:
[( 820 - 949 ) ÷ 949] x 100 = -13.59%
Formula
Percentage change = [(820 - 949) / 949] x 100
Subtract the new number by the original number
820 - 949 = -129
-129 ÷ 949 = -0.13593256059009484
-0.13593256059009484 x 100 = -13.59%