-82.45% is the change from 815 to 143
Calculation steps:
[( 143 - 815 ) ÷ 815] x 100 = -82.45%
Formula
Percentage change = [(143 - 815) / 815] x 100
Subtract the new number by the original number
143 - 815 = -672
-672 ÷ 815 = -0.8245398773006135
-0.8245398773006135 x 100 = -82.45%