This year, Hanoi was ranked 107^th out of the 140 surveyed countries with nearly 60 points, up 5.5 percent, while HCM City came in 116^th place with 57 points, up 4.4 percent. The rapid economic development, along with higher scores in the fields of recreational and art activities, private education, and road infrastructure, were the main factors that helped the cities increase their positions. Those that score highest tend to be mid-sized cities in wealthier countries, according to the survey. Several cities in the top ten also have relatively low population density. This quality fosters a range of recreational activities, without leading to higher levels of crime or overburdened infrastructure. The survey of liveable cities is conducted annually based on various criteria such as stability, health care, culture and environment, education, and infrastructure.