Birmingham-based Infinity Property and Casualty Corp. (NASDAQ: IPCC) on Tuesday declared a quarterly dividend for its shareholders of $0.36 per share. The dividend represents a 20 percent increase from the company's previous $0.30 per share. The new dividend will be payable on March 28 to shareholders as of March 14. Infinity, an auto insurance provider, will announce its fourth quarter earnings on Thursday, Feb. 27.