-21.51% is the change from 651 to 511
Calculation steps:
[( 511 - 651 ) ÷ 651] x 100 = -21.51%
Formula
Percentage change = [(511 - 651) / 651] x 100
Subtract the new number by the original number
511 - 651 = -140
-140 ÷ 651 = -0.21505376344086022
-0.21505376344086022 x 100 = -21.51%