Tehran, Sept 25, IRNA – Initial calculations of Economic and Statistical Affairs Office of Central Bank of Iran (CBI) indicate that the country's Gross National Product (GNP) amounted to 480,491 billion rials in spring of 2014, showing a positive 4.6% growth year on year. Keeping in mind the minus 4.1% economic growth of the country in the spring of 2013 the country's economic growth has been 8.7% during the past two years. Meanwhile, President Hassan Rouhani recently reported that the country's economy's previous 40% inflation rate has been lowered to 25% and promised to further lower it to a single digit figure in another year's time.