Transformer Oil Market – Global Industry Size, Share, Trends, Opportunity, and Forecast 2018-2028, Segmented By Type (Naphthenic Oil, Paraffinic Oil, Silicone-based Oil, Bio-based Oil, and Others), By Function (Insulator, Cooling Agent, Lubricant, and Chemical Stabilizer), By End Use (Small Transformer, Large Transformer, Utility Transformers, Distribution Transformers, Power Transformers, and Oth