-67.7% is the change from 836 to 270
Calculation steps:
[( 270 - 836 ) ÷ 836] x 100 = -67.7%
Formula
Percentage change = [(270 - 836) / 836] x 100
Subtract the new number by the original number
270 - 836 = -566
-566 ÷ 836 = -0.6770334928229665
-0.6770334928229665 x 100 = -67.7%