-70.78% is the change from 664 to 194
Calculation steps:
[( 194 - 664 ) ÷ 664] x 100 = -70.78%
Formula
Percentage change = [(194 - 664) / 664] x 100
Subtract the new number by the original number
194 - 664 = -470
-470 ÷ 664 = -0.7078313253012049
-0.7078313253012049 x 100 = -70.78%