-3.3% is the change from 637 to 616
Calculation steps:
[( 616 - 637 ) ÷ 637] x 100 = -3.3%
Formula
Percentage change = [(616 - 637) / 637] x 100
Subtract the new number by the original number
616 - 637 = -21
-21 ÷ 637 = -0.03296703296703297
-0.03296703296703297 x 100 = -3.3%