Tourism will grow in Iran,why?

Tourism is increasing in my country,Iran. According to the government's report the number of foreign tourists who have come to Iran rose in 2000 to 2009. Also the domestic tourist arrivals grew dramatically at the same period of time. The effect of the tourism industry is obvious in the several cities namely, Shiraz, Esfehan, Tehran and north of Iran. Some hotels are built and historic places are repaired. Therefore, many people go to work. It is thought that tourism will slighty increase in the next few years.