-41.11% is the change from 664 to 391
Calculation steps:
[( 391 - 664 ) ÷ 664] x 100 = -41.11%
Formula
Percentage change = [(391 - 664) / 664] x 100
Subtract the new number by the original number
391 - 664 = -273
-273 ÷ 664 = -0.411144578313253
-0.411144578313253 x 100 = -41.11%