-6.5% is the change from 200 to 187
Calculation steps:
[( 187 - 200 ) ÷ 200] x 100 = -6.5%
Formula
Percentage change = [(187 - 200) / 200] x 100
Subtract the new number by the original number
187 - 200 = -13
-13 ÷ 200 = -0.065
-0.065 x 100 = -6.5%
Example