-15.8% is the change from 766 to 645
Calculation steps:
[( 645 - 766 ) ÷ 766] x 100 = -15.8%
Formula
Percentage change = [(645 - 766) / 766] x 100
Subtract the new number by the original number
645 - 766 = -121
-121 ÷ 766 = -0.15796344647519583
-0.15796344647519583 x 100 = -15.8%