Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| name | map colour | first operated | type | length | no sta | current stock | future stock | trips per annum (1000) | avg trips per mile (1000) |
| bakerloo line | brown | 1906 | deep tube | 23.2 km 14.5 mi | 25 | 1972 stock | n / a | 111136 | 7665 |
| central line | red | 1900 | deep tube | 74 0 km 46 0 mi | 49 | 1992 stock | n / a | 260916 | 5672 |
| circle line | yellow | 1871 | sub surface | 27.2 km 17 0 mi | 36 | c stock s stock | s stock (currently replacing c stock) | 114609 | 4716 |
| district line | green | 1868 | sub surface | 64 0 km 40 0 mi | 60 | c stock and d78 stock | s stock from 2014 | 208317 | 5208 |
| hammersmith & city line | pink | 1864 | sub surface | 25.5 km 15.9 mi | 29 | c stock s stock | s stock (currently replacing c stock) | 114609 | 4716 |
| jubilee line | silver | 1979 | deep tube | 36.2 km 22.5 mi | 27 | 1996 stock | n / a | 213554 | 9491 |
| metropolitan line | purple | 1863 | sub surface | 66.7 km 41.5 mi | 34 | s stock | n / a | 66779 | 1609 |
| northern line | black | 1890 | deep tube | 58 0 km 36 0 mi | 50 | 1995 stock | n / a | 252310 | 7009 |
| piccadilly line | dark blue | 1906 | deep tube | 71 0 km 44.3 mi | 53 | 1973 stock | n / a | 210169 | 4744 |
| victoria line | light blue | 1968 | deep tube | 21 0 km 13.3 mi | 16 | 2009 stock | n / a | 199988 | 15093 |
| waterloo & city line | turquoise | 1898 | deep tube | 2.5 km 1.5 mi | 2 | 1992 stock | n / a | 15892 | 10595 |
Title:
london underground
Statement:
the 1973 stock is the current stock when the avg trips per mile (x1000) is 4744
Answer:
supported