2017 4 | 2017 | | | | | 2.8 | 21.4 | | | | 21.4 | 20.6 | | 18.2 | | | | | 6 | | 6 | 8 | | | 8 | | | 2017 12 31 | 18 6 30 | 17 | 18 | | | | |