-19.64% is the change from 387 to 311
Calculation steps:
[( 311 - 387 ) ÷ 387] x 100 = -19.64%
Formula
Percentage change = [(311 - 387) / 387] x 100
Subtract the new number by the original number
311 - 387 = -76
-76 ÷ 387 = -0.19638242894056848
-0.19638242894056848 x 100 = -19.64%