Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Line | Speed | Length | Construction begun | Expected start of revenue services |
| --- | --- | --- | --- | --- |
| Svilengrad -Turkish Border | 200km/h | 19km | 2010 | 2012.0 |
| Dimitrovgrad - Svilengrad | 200km/h | 70km | 2012 | 2013.0 |
| Plovdiv - Burgas | 200km/h | 291km | 2010 | 2013.0 |
| Sofia - Plovdiv | 200km/h | 156km | 2010 | 2015.0 |
| Sofia - Radomir | 200km/h | 53km | 2014 | 2017.0 |
| Sofia - Dragoman | 200km/h | 44km | 2014 | 2017.0 |
| Vidin - Sofia | 200km/h | 222km | Unknown | 2020.0 |
Question:
What is the length when the expected start of revenue is more than 2017?
Answer:
222km