Dubai can either refer to an emirate (one of seven) in the United Arab Emirates (UAE) in the eastern Arabian Peninsula, or that emirate's main city, sometimes called "Dubai city" to distinguish it from the emirate. Dubai has a diverse and multicultural society. The city's cultural imprint as a small, ethnically homogenous pearling community was changed with the arrival of other ethnic groups and nationals — first by the Iranians in the early 1900s, and later by Indians and Pakistanis in the 1960s. Despite the diversity of the population, only minor and infrequent episodes of ethnic tensions, primarily between expatriates, have been reported in the city. In 1994, Hindu and Muslim labourers clashed over the destruction of the Babri Masjid in Ayodhya, India, which resulted in the detainment and deportation of hundreds of Indian and Pakistani workers. Although Dubai's economy was built on the back of the oil industry, revenues from oil and natural gas currently account for less than 6% of the emirate's revenues. Historically, Dubai and its twin across the Dubai creek, Deira (independent of Dubai City at that time), became important ports of call for Western manufacturers. Most of the new city's banking and financial centres were headquartered in the port area. Dubai maintained its importance as a trade route through the 1970s and 1980s. Dubai has a free trade in gold and until the 1990s, was the hub of a "brisk smuggling trade" of gold ingots to India, where gold import was restricted.