-16.46% is the change from 644 to 538
Calculation steps:
[( 538 - 644 ) ÷ 644] x 100 = -16.46%
Formula
Percentage change = [(538 - 644) / 644] x 100
Subtract the new number by the original number
538 - 644 = -106
-106 ÷ 644 = -0.16459627329192547
-0.16459627329192547 x 100 = -16.46%