66400% is the change from 1 to 665
Calculation steps:
[( 665 - 1 ) ÷ 1] x 100 = 66400%
Formula
Percentage change = [(665 - 1) / 1] x 100
Subtract the new number by the original number
665 - 1 = 664
664 ÷ 1 = 664
664 x 100 = 66400%
Example