-21.35% is the change from 651 to 512
Calculation steps:
[( 512 - 651 ) ÷ 651] x 100 = -21.35%
Formula
Percentage change = [(512 - 651) / 651] x 100
Subtract the new number by the original number
512 - 651 = -139
-139 ÷ 651 = -0.21351766513056836
-0.21351766513056836 x 100 = -21.35%