Thailand's economy is expected to grow within a range of 1.6% to 2.0% this year, a leading business group said on Wednesday, maintaining its previous forecast amid political turmoil and a likely decline in exports from last year's high base. Exports, a key driver of Thai growth, are projected to drop by between 0.5% and 1.5% this year, also unchanged from a previous prediction, the Joint Standing Committee on Commerce, Industry and Banking said.