-67.1% is the change from 991 to 326
Calculation steps:
[( 326 - 991 ) ÷ 991] x 100 = -67.1%
Formula
Percentage change = [(326 - 991) / 991] x 100
Subtract the new number by the original number
326 - 991 = -665
-665 ÷ 991 = -0.6710393541876892
-0.6710393541876892 x 100 = -67.1%