-97.98% is the change from 939 to 19
Calculation steps:
[( 19 - 939 ) ÷ 939] x 100 = -97.98%
Formula
Percentage change = [(19 - 939) / 939] x 100
Subtract the new number by the original number
19 - 939 = -920
-920 ÷ 939 = -0.979765708200213
-0.979765708200213 x 100 = -97.98%