-50.51% is the change from 691 to 342
Calculation steps:
[( 342 - 691 ) ÷ 691] x 100 = -50.51%
Formula
Percentage change = [(342 - 691) / 691] x 100
Subtract the new number by the original number
342 - 691 = -349
-349 ÷ 691 = -0.5050651230101303
-0.5050651230101303 x 100 = -50.51%