-24.85% is the change from 680 to 511
Calculation steps:
[( 511 - 680 ) ÷ 680] x 100 = -24.85%
Formula
Percentage change = [(511 - 680) / 680] x 100
Subtract the new number by the original number
511 - 680 = -169
-169 ÷ 680 = -0.2485294117647059
-0.2485294117647059 x 100 = -24.85%