-49.92% is the change from 621 to 311
Calculation steps:
[( 311 - 621 ) ÷ 621] x 100 = -49.92%
Formula
Percentage change = [(311 - 621) / 621] x 100
Subtract the new number by the original number
311 - 621 = -310
-310 ÷ 621 = -0.499194847020934
-0.499194847020934 x 100 = -49.92%