Reuters - (The following statement was released by rating agency RPT-Fitch Solutions) Credit default swaps (CDS) on Diamond Offshore Drilling Inc. (Diamond) have widened 47% over the past month, according to Fitch Solutions. Diamond's CDS significantly underperformed the 3.4% CDS tightening for the broader North America oil and gas sector over the same time period. Additionally, the cost of credit protection on Diamond's debt has been climbing steadily since late January. After trading consistently at 'A/A+' levels since November 2013…