-69.4% is the change from 830 to 254
Calculation steps:
[( 254 - 830 ) ÷ 830] x 100 = -69.4%
Formula
Percentage change = [(254 - 830) / 830] x 100
Subtract the new number by the original number
254 - 830 = -576
-576 ÷ 830 = -0.6939759036144578
-0.6939759036144578 x 100 = -69.4%