| | December 31, 2017 | | December 31, 2016 | | December 31, 2015 | | |||
Within 1 year | | | 2,006 | | | 1,984 | | | 2,055 | |
After 1 year but not more than 5 years | | | 7,335 | | | 7,362 | | | 6,731 | |
More than 5 years | | | 8,814 | | | 10,638 | | | 14,128 | |
Total | | | 18,155 | | | 19,984 | | | 22,914 | |