-23.2% is the change from 832 to 639
Calculation steps:
[( 639 - 832 ) ÷ 832] x 100 = -23.2%
Formula
Percentage change = [(639 - 832) / 832] x 100
Subtract the new number by the original number
639 - 832 = -193
-193 ÷ 832 = -0.23197115384615385
-0.23197115384615385 x 100 = -23.2%