-20.52% is the change from 814 to 647
Calculation steps:
[( 647 - 814 ) ÷ 814] x 100 = -20.52%
Formula
Percentage change = [(647 - 814) / 814] x 100
Subtract the new number by the original number
647 - 814 = -167
-167 ÷ 814 = -0.20515970515970516
-0.20515970515970516 x 100 = -20.52%