-1.83% is the change from 655 to 643
Calculation steps:
[( 643 - 655 ) ÷ 655] x 100 = -1.83%
Formula
Percentage change = [(643 - 655) / 655] x 100
Subtract the new number by the original number
643 - 655 = -12
-12 ÷ 655 = -0.0183206106870229
-0.0183206106870229 x 100 = -1.83%