-17.7% is the change from 644 to 530
Calculation steps:
[( 530 - 644 ) ÷ 644] x 100 = -17.7%
Formula
Percentage change = [(530 - 644) / 644] x 100
Subtract the new number by the original number
530 - 644 = -114
-114 ÷ 644 = -0.17701863354037267
-0.17701863354037267 x 100 = -17.7%