-77.35% is the change from 830 to 188
Calculation steps:
[( 188 - 830 ) ÷ 830] x 100 = -77.35%
Formula
Percentage change = [(188 - 830) / 830] x 100
Subtract the new number by the original number
188 - 830 = -642
-642 ÷ 830 = -0.7734939759036145
-0.7734939759036145 x 100 = -77.35%