Median family income question

I’m gathering data on median family income in Illinois from 2009 to 2016, using 5-year estimates. Is it appropriate to adjust those numbers for inflation using the consumer price index? The data indicate that incomes have been increasing steadily all that time until I adjust it for inflation to 2016 dollars, at which point it says median family income has been *decreasing* every year. Any help would be greatly appreciated!
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