-30.65% is the change from 930 to 645
Calculation steps:
[( 645 - 930 ) ÷ 930] x 100 = -30.65%
Formula
Percentage change = [(645 - 930) / 930] x 100
Subtract the new number by the original number
645 - 930 = -285
-285 ÷ 930 = -0.3064516129032258
-0.3064516129032258 x 100 = -30.65%