-1.69% is the change from 651 to 640
Calculation steps:
[( 640 - 651 ) ÷ 651] x 100 = -1.69%
Formula
Percentage change = [(640 - 651) / 651] x 100
Subtract the new number by the original number
640 - 651 = -11
-11 ÷ 651 = -0.016897081413210446
-0.016897081413210446 x 100 = -1.69%