-78.8% is the change from 651 to 138
Calculation steps:
[( 138 - 651 ) ÷ 651] x 100 = -78.8%
Formula
Percentage change = [(138 - 651) / 651] x 100
Subtract the new number by the original number
138 - 651 = -513
-513 ÷ 651 = -0.7880184331797235
-0.7880184331797235 x 100 = -78.8%