-18.43% is the change from 814 to 664
Calculation steps:
[( 664 - 814 ) ÷ 814] x 100 = -18.43%
Formula
Percentage change = [(664 - 814) / 814] x 100
Subtract the new number by the original number
664 - 814 = -150
-150 ÷ 814 = -0.18427518427518427
-0.18427518427518427 x 100 = -18.43%