-83.7% is the change from 92 to 15
Calculation steps:
[( 15 - 92 ) ÷ 92] x 100 = -83.7%
Formula
Percentage change = [(15 - 92) / 92] x 100
Subtract the new number by the original number
15 - 92 = -77
-77 ÷ 92 = -0.8369565217391305
-0.8369565217391305 x 100 = -83.7%