-93.87% is the change from 310 to 19
Calculation steps:
[( 19 - 310 ) ÷ 310] x 100 = -93.87%
Formula
Percentage change = [(19 - 310) / 310] x 100
Subtract the new number by the original number
19 - 310 = -291
-291 ÷ 310 = -0.9387096774193548
-0.9387096774193548 x 100 = -93.87%