-1.98% is the change from 657 to 644
Calculation steps:
[( 644 - 657 ) ÷ 657] x 100 = -1.98%
Formula
Percentage change = [(644 - 657) / 657] x 100
Subtract the new number by the original number
644 - 657 = -13
-13 ÷ 657 = -0.0197869101978691
-0.0197869101978691 x 100 = -1.98%