2.06% is the change from 971 to 991
Calculation steps:
[( 991 - 971 ) ÷ 971] x 100 = 2.06%
Formula
Percentage change = [(991 - 971) / 971] x 100
Subtract the new number by the original number
991 - 971 = 20
20 ÷ 971 = 0.02059732234809475
0.02059732234809475 x 100 = 2.06%