-31.24% is the change from 938 to 645
Calculation steps:
[( 645 - 938 ) ÷ 938] x 100 = -31.24%
Formula
Percentage change = [(645 - 938) / 938] x 100
Subtract the new number by the original number
645 - 938 = -293
-293 ÷ 938 = -0.31236673773987206
-0.31236673773987206 x 100 = -31.24%