Medical tourism has emerged as an integral component of Penang's services sector. George Town, in particular, has become the centre of medical tourism within Malaysia, attracting approximately half of the nation's medical tourist arrivals in 2013 and generating about 70% of the country's medical tourism revenue.Penang also has a vibrant retail sub-sector, which employs as many as 24% of Penang's workforce. As the main shopping destination in northern Malaysia, Penang is home to several shopping malls, such as Gurney Plaza, Gurney Paragon, 1st Avenue Mall, Straits Quay, Queensbay Mall and Design Village. While shopping malls now dominate the retail scene, centuries-old shophouses are still operating alongside George Town's flea markets and wet markets, all of which cater more to local products, including spices, nutmegs and "tau sar pneah", a famous Penang delicacy.