-92.92% is the change from 212 to 15
Calculation steps:
[( 15 - 212 ) ÷ 212] x 100 = -92.92%
Formula
Percentage change = [(15 - 212) / 212] x 100
Subtract the new number by the original number
15 - 212 = -197
-197 ÷ 212 = -0.9292452830188679
-0.9292452830188679 x 100 = -92.92%