-2.05% is the change from 633 to 620
Calculation steps:
[( 620 - 633 ) ÷ 633] x 100 = -2.05%
Formula
Percentage change = [(620 - 633) / 633] x 100
Subtract the new number by the original number
620 - 633 = -13
-13 ÷ 633 = -0.020537124802527645
-0.020537124802527645 x 100 = -2.05%