-63.01% is the change from 830 to 307
Calculation steps:
[( 307 - 830 ) ÷ 830] x 100 = -63.01%
Formula
Percentage change = [(307 - 830) / 830] x 100
Subtract the new number by the original number
307 - 830 = -523
-523 ÷ 830 = -0.6301204819277109
-0.6301204819277109 x 100 = -63.01%