-1.67% is the change from 657 to 646
Calculation steps:
[( 646 - 657 ) ÷ 657] x 100 = -1.67%
Formula
Percentage change = [(646 - 657) / 657] x 100
Subtract the new number by the original number
646 - 657 = -11
-11 ÷ 657 = -0.0167427701674277
-0.0167427701674277 x 100 = -1.67%