-19.88% is the change from 644 to 516
Calculation steps:
[( 516 - 644 ) ÷ 644] x 100 = -19.88%
Formula
Percentage change = [(516 - 644) / 644] x 100
Subtract the new number by the original number
516 - 644 = -128
-128 ÷ 644 = -0.19875776397515527
-0.19875776397515527 x 100 = -19.88%