-6.39% is the change from 971 to 909
Calculation steps:
[( 909 - 971 ) ÷ 971] x 100 = -6.39%
Formula
Percentage change = [(909 - 971) / 971] x 100
Subtract the new number by the original number
909 - 971 = -62
-62 ÷ 971 = -0.06385169927909372
-0.06385169927909372 x 100 = -6.39%