-18.6% is the change from 785 to 639
Calculation steps:
[( 639 - 785 ) ÷ 785] x 100 = -18.6%
Formula
Percentage change = [(639 - 785) / 785] x 100
Subtract the new number by the original number
639 - 785 = -146
-146 ÷ 785 = -0.1859872611464968
-0.1859872611464968 x 100 = -18.6%