NY -- Standard&Poor's CreditWire 12/14/98 – Standard&Poor's today assigned its single-'A'-minus rating to New York City, N.Y.'s $99.35 million GO bonds series 1999E due Aug. 1, 2022 and $23.74 million taxable GO bonds series 1999E due Aug. 1,, 2001. The bonds are scheduled to sell Dec. 16, 1998. At the same time, Standard&Poor's affirmed its ratings on the city's outstanding debt (see list below). The rating reflects: -- Improved financial performance. The city has produced recent budget surpluses, demonstrated willingness to curtail expenditure growth, and reduced the out-year gaps. In addition, the city has started to experience an increase in property tax revenues and has limited its use of nonrecurring revenues. The rating anticipates