-34.62% is the change from 985 to 644
Calculation steps:
[( 644 - 985 ) ÷ 985] x 100 = -34.62%
Formula
Percentage change = [(644 - 985) / 985] x 100
Subtract the new number by the original number
644 - 985 = -341
-341 ÷ 985 = -0.3461928934010152
-0.3461928934010152 x 100 = -34.62%