-75.06% is the change from 830 to 207
Calculation steps:
[( 207 - 830 ) ÷ 830] x 100 = -75.06%
Formula
Percentage change = [(207 - 830) / 830] x 100
Subtract the new number by the original number
207 - 830 = -623
-623 ÷ 830 = -0.7506024096385542
-0.7506024096385542 x 100 = -75.06%