-1.98% is the change from 101 to 99
Calculation steps:
[( 99 - 101 ) ÷ 101] x 100 = -1.98%
Formula
Percentage change = [(99 - 101) / 101] x 100
Subtract the new number by the original number
99 - 101 = -2
-2 ÷ 101 = -0.019801980198019802
-0.019801980198019802 x 100 = -1.98%