-82.66% is the change from 173 to 30
Calculation steps:
[( 30 - 173 ) ÷ 173] x 100 = -82.66%
Formula
Percentage change = [(30 - 173) / 173] x 100
Subtract the new number by the original number
30 - 173 = -143
-143 ÷ 173 = -0.8265895953757225
-0.8265895953757225 x 100 = -82.66%