Nashville and Davidson County Metropolitan Government, Tenn.'s bonds are secured by the full faith and credit of the metropolitan government. The rating reflects: A diverse and expanding economic base, Above-average wealth and income levels, Low tax rates, Sound financial performance and an improving financial position, and Moderate debt levels with a rapid amortization schedule. The rating take into account the city's use of its strong financial reserves in fiscals 1998 and 1999 to meet unexpected costs associated with a tornado that hit downtown Nashville in April 1998 and the associated decline in sales tax revenues due to the tornado and the closure of Opryland. Opry Mills, a 1.1 million square-foot retail mall and entertainment center opened in May 2000. A