Rent net income (or loss) excludes sole proprietorship (including farm) rental income or loss; these are included in business or profession net income or loss. Rental losses are before "passive loss" limitation and, therefore, exceed the amount included in Adjusted Gross Income (AGI).
For additional information about the return filing requirements, see the annual reports, Statistics of Income-Individual Income Tax Returns at https://www.irs.gov/uac/soi-tax-stats-historical-data-tables.
U.S. Department of the Treasury. Internal Revenue Service, Individual Income Tax Filing: Adjusted Gross Income (AGI): Rent Net Income [RTNINC], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RTNINC, September 21, 2017.