-0.73% is the change from 827 to 821
Calculation steps:
[( 821 - 827 ) ÷ 827] x 100 = -0.73%
Formula
Percentage change = [(821 - 827) / 827] x 100
Subtract the new number by the original number
821 - 827 = -6
-6 ÷ 827 = -0.007255139056831923
-0.007255139056831923 x 100 = -0.73%