-50.89% is the change from 621 to 305
Calculation steps:
[( 305 - 621 ) ÷ 621] x 100 = -50.89%
Formula
Percentage change = [(305 - 621) / 621] x 100
Subtract the new number by the original number
305 - 621 = -316
-316 ÷ 621 = -0.5088566827697263
-0.5088566827697263 x 100 = -50.89%