(ANSA) - TRIESTE, MAY 15 - Slovenian energy company Petrol reported a 73% drop in first-quarter net profit, blaming Slovenia's fuel price regulation regime for losses in its core petroleum products business despite significantly higher sales volumes, according to Slovenian news agency STA. According to Friday's earnings release, the group's net profit was EUR 8 million, a 73% decrease from the previous year, as revenue remained flat at EUR 1.53 billion despite a 10% increase in volume sales of petroleum products, its core business. (ANSA).