-75.3% is the change from 830 to 205
Calculation steps:
[( 205 - 830 ) ÷ 830] x 100 = -75.3%
Formula
Percentage change = [(205 - 830) / 830] x 100
Subtract the new number by the original number
205 - 830 = -625
-625 ÷ 830 = -0.7530120481927711
-0.7530120481927711 x 100 = -75.3%