June 30 (SeeNews) - Bulgaria's first-half consolidated budget surplus is seen reaching 3.086 billion levs ($1.74 billion/1.57 billion euro), or 3.5% of the country's gross domestic product (GDP), compared to 889.5 million levs, or 1.0% of GDP, in the same period of 2015, preliminary estimates of the country's finance ministry showed on Thursday.