-19.72% is the change from 644 to 517
Calculation steps:
[( 517 - 644 ) ÷ 644] x 100 = -19.72%
Formula
Percentage change = [(517 - 644) / 644] x 100
Subtract the new number by the original number
517 - 644 = -127
-127 ÷ 644 = -0.1972049689440994
-0.1972049689440994 x 100 = -19.72%