-70.5% is the change from 644 to 190
Calculation steps:
[( 190 - 644 ) ÷ 644] x 100 = -70.5%
Formula
Percentage change = [(190 - 644) / 644] x 100
Subtract the new number by the original number
190 - 644 = -454
-454 ÷ 644 = -0.7049689440993789
-0.7049689440993789 x 100 = -70.5%