-6.52% is the change from 690 to 645
Calculation steps:
[( 645 - 690 ) ÷ 690] x 100 = -6.52%
Formula
Percentage change = [(645 - 690) / 690] x 100
Subtract the new number by the original number
645 - 690 = -45
-45 ÷ 690 = -0.06521739130434782
-0.06521739130434782 x 100 = -6.52%