Users of South Korea's public transportation system became less satisfied with overall services from a year earlier in 2015 with many pointing to overcrowding as a major problem, a survey showed Thursday.

In the annual survey conducted by the Ministry of Land, Infrastructure and Transport, the country's public transportation system scored 4.78 points out of a possible 7 in terms of user satisfaction, compared with 4.84 points in the previous year.

The outcome was based on points given by 83,600 people who are aged over 15 and use public transportation services at least four times a week.

The drop in overall satisfaction was largely caused by a growing number of users, which apparently led to an increase in duration of travel.

In terms of duration of travel, those surveyed gave an average 4.66 points in 2015, down from 4.77 points a year earlier, while public transportation services received the lowest score of 3.86 points out of all categories for overcrowding, according to the ministry.

Overcrowding especially appeared to be a serious problem in the capital region, which accounted for 74 percent of all public transportation services used in 2015.

On weekdays, an average 12.77 million people used public transportation services per day in 2015, the ministry said. (Yonhap)