-2.21% is the change from 634 to 620
Calculation steps:
[( 620 - 634 ) ÷ 634] x 100 = -2.21%
Formula
Percentage change = [(620 - 634) / 634] x 100
Subtract the new number by the original number
620 - 634 = -14
-14 ÷ 634 = -0.022082018927444796
-0.022082018927444796 x 100 = -2.21%