-6.46% is the change from 820 to 767
Calculation steps:
[( 767 - 820 ) ÷ 820] x 100 = -6.46%
Formula
Percentage change = [(767 - 820) / 820] x 100
Subtract the new number by the original number
767 - 820 = -53
-53 ÷ 820 = -0.06463414634146342
-0.06463414634146342 x 100 = -6.46%