-92.75% is the change from 207 to 15
Calculation steps:
[( 15 - 207 ) ÷ 207] x 100 = -92.75%
Formula
Percentage change = [(15 - 207) / 207] x 100
Subtract the new number by the original number
15 - 207 = -192
-192 ÷ 207 = -0.927536231884058
-0.927536231884058 x 100 = -92.75%