Due to the one country, two systems policy of China regarding its special administrative regions, Macau is able to retain Portuguese as an official language alongside Cantonese. Portuguese was first introduced to Macau when Portuguese traders established a permanent settlement there in 1537. Despite being a Portuguese colony for over four centuries, the Portuguese language was never widely spoken in Macau and remained limited to administration and higher education. It was spoken primarily by the Portuguese colonists, Macanese people of mixed ancestry, and elites and middle-class people of pure Chinese blood. As a consequence, when Macau was handed back to China in 1999, Portuguese did not have a strong presence like English had in Hong Kong and continued its decline which began when Macau was still under Portuguese rule. Nevertheless, it was only after Portuguese rule ended that the Portuguese language in Macau began to see an increase in speakers due to China's increased trading relations with Lusophone countries. There has been an increase in the teaching of Portuguese owing to the growing trade links between China and lusophone nations such as Portugal, Brazil, Angola, Mozambique, and East Timor, with 5,000 students learning the language. Today, about 3% of Macau's population speaks Portuguese as a first language and 7% of the population professes fluency. Code-switching between Cantonese and Portuguese are commonly heard. A Portuguese creole called Macanese (Patuá) was spoken by Macanese of mixed ancestry but is near extinction today.