In just two days last week, the exchange traded note ( ETN ) that tracks it dropped by more than 20 per cent, and speculation that China will increase interest rates to keep inflation at bay sent fear through the market.Debarati Roy for Bloomberg reported that both international and domestic sugar prices had hit 30 year highs in 2010 when indexes on the iPath Dow Jones UBSSugar TR sub-Index (NYSEArca: SGG) were higher than 92% over the past six months with no intervention.