-20.76% is the change from 814 to 645
Calculation steps:
[( 645 - 814 ) ÷ 814] x 100 = -20.76%
Formula
Percentage change = [(645 - 814) / 814] x 100
Subtract the new number by the original number
645 - 814 = -169
-169 ÷ 814 = -0.2076167076167076
-0.2076167076167076 x 100 = -20.76%