-18.6% is the change from 817 to 665
Calculation steps:
[( 665 - 817 ) ÷ 817] x 100 = -18.6%
Formula
Percentage change = [(665 - 817) / 817] x 100
Subtract the new number by the original number
665 - 817 = -152
-152 ÷ 817 = -0.18604651162790697
-0.18604651162790697 x 100 = -18.6%