Dubai Naturalization and Residency Department (DNRD) has said that the number of visitor from Gulf countries has seen a 36.5% increase during the first half of Dubai Summer Surprise. 'Omani nationals are by far the largest in number, followed by Kuwaitis, Saudis, Bahrainis and Qataris. But by the early days of July the number of Saudis has increased to a large extent,' the DNRD has said.