Stag Industrial should be able to continue growing its monthly income stream. Stag Industrial (STAG -1.64%) churns out dividend income like clockwork. The real estate investment trust (REIT) pays a high-yielding monthly dividend. At 3.5%, it's more than double that of the S&P 500. Adding to its appeal, Stag Industrial has increased its dividend every year since it went public in 2011. Slow and steady has been the name of the game for this industrial REIT over the years. But it has shifted into a higher gear ...