-52.4% is the change from 813 to 387
Calculation steps:
[( 387 - 813 ) ÷ 813] x 100 = -52.4%
Formula
Percentage change = [(387 - 813) / 813] x 100
Subtract the new number by the original number
387 - 813 = -426
-426 ÷ 813 = -0.5239852398523985
-0.5239852398523985 x 100 = -52.4%