-57.2% is the change from 715 to 306
Calculation steps:
[( 306 - 715 ) ÷ 715] x 100 = -57.2%
Formula
Percentage change = [(306 - 715) / 715] x 100
Subtract the new number by the original number
306 - 715 = -409
-409 ÷ 715 = -0.5720279720279721
-0.5720279720279721 x 100 = -57.2%