-1.03% is the change from 677 to 670
Calculation steps:
[( 670 - 677 ) ÷ 677] x 100 = -1.03%
Formula
Percentage change = [(670 - 677) / 677] x 100
Subtract the new number by the original number
670 - 677 = -7
-7 ÷ 677 = -0.0103397341211226
-0.0103397341211226 x 100 = -1.03%