Subtract the original value from the final value to find the trend as measured in raw increase or decrease. For example, if a mutual fund increased from $1,600 to $1,800, subtract $1,600 from $1,800 to find the annual trend is to increase by $200.
Divide the annual trend expressed as a raw number by the original amount to find the annual trend expressed as a rate. In this example, divide the increase of $200 by $1,600 to find the rate equals 0.125.
Multiply the annual trend expressed as a rate by 100 to find the annual trend expressed as a percentage. In this example, multiply 0.125 by 100 to find the annual trend is an increase of 12.5 percent.