-83.87% is the change from 186 to 30
Calculation steps:
[( 30 - 186 ) ÷ 186] x 100 = -83.87%
Formula
Percentage change = [(30 - 186) / 186] x 100
Subtract the new number by the original number
30 - 186 = -156
-156 ÷ 186 = -0.8387096774193549
-0.8387096774193549 x 100 = -83.87%