-30.7% is the change from 645 to 447
Calculation steps:
[( 447 - 645 ) ÷ 645] x 100 = -30.7%
Formula
Percentage change = [(447 - 645) / 645] x 100
Subtract the new number by the original number
447 - 645 = -198
-198 ÷ 645 = -0.30697674418604654
-0.30697674418604654 x 100 = -30.7%