-92.62% is the change from 691 to 51
Calculation steps:
[( 51 - 691 ) ÷ 691] x 100 = -92.62%
Formula
Percentage change = [(51 - 691) / 691] x 100
Subtract the new number by the original number
51 - 691 = -640
-640 ÷ 691 = -0.9261939218523878
-0.9261939218523878 x 100 = -92.62%
Example