-52.31% is the change from 648 to 309
Calculation steps:
[( 309 - 648 ) ÷ 648] x 100 = -52.31%
Formula
Percentage change = [(309 - 648) / 648] x 100
Subtract the new number by the original number
309 - 648 = -339
-339 ÷ 648 = -0.5231481481481481
-0.5231481481481481 x 100 = -52.31%