South Korea's fiscal deficit narrowed to a multi-year low in the first half on the back of robust tax revenue, government data showed Thursday.The consolidated fiscal balance, or gross revenue minus gross expenditure, posted a deficit of 43.9 trillion won (31.0 billion U.S. dollars) in the January-June period, down from 68.6 trillion won (48.4 billion dollars) in the same period of last year, according to the Ministry of Planning and Budget. [....]