-19.17% is the change from 798 to 645
Calculation steps:
[( 645 - 798 ) ÷ 798] x 100 = -19.17%
Formula
Percentage change = [(645 - 798) / 798] x 100
Subtract the new number by the original number
645 - 798 = -153
-153 ÷ 798 = -0.19172932330827067
-0.19172932330827067 x 100 = -19.17%