-66.54% is the change from 807 to 270
Calculation steps:
[( 270 - 807 ) ÷ 807] x 100 = -66.54%
Formula
Percentage change = [(270 - 807) / 807] x 100
Subtract the new number by the original number
270 - 807 = -537
-537 ÷ 807 = -0.6654275092936803
-0.6654275092936803 x 100 = -66.54%