-18.7% is the change from 797 to 648
Calculation steps:
[( 648 - 797 ) ÷ 797] x 100 = -18.7%
Formula
Percentage change = [(648 - 797) / 797] x 100
Subtract the new number by the original number
648 - 797 = -149
-149 ÷ 797 = -0.18695106649937265
-0.18695106649937265 x 100 = -18.7%