-92.11% is the change from 836 to 66
Calculation steps:
[( 66 - 836 ) ÷ 836] x 100 = -92.11%
Formula
Percentage change = [(66 - 836) / 836] x 100
Subtract the new number by the original number
66 - 836 = -770
-770 ÷ 836 = -0.9210526315789473
-0.9210526315789473 x 100 = -92.11%