-3.31% is the change from 634 to 613
Calculation steps:
[( 613 - 634 ) ÷ 634] x 100 = -3.31%
Formula
Percentage change = [(613 - 634) / 634] x 100
Subtract the new number by the original number
613 - 634 = -21
-21 ÷ 634 = -0.033123028391167195
-0.033123028391167195 x 100 = -3.31%