2.54% is the change from 670 to 687
Calculation steps:
[( 687 - 670 ) ÷ 670] x 100 = 2.54%
Formula
Percentage change = [(687 - 670) / 670] x 100
Subtract the new number by the original number
687 - 670 = 17
17 ÷ 670 = 0.025373134328358207
0.025373134328358207 x 100 = 2.54%