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:
| Club | Wins | Last win | Runners-up | Last final lost |
| --- | --- | --- | --- | --- |
| Rangers | 48 | 2013 | 20 | 2011 |
| Celtic | 31 | 2011 | 31 | 2013 |
| Partick Thistle | 7 | 1989 | 11 | 1969 |
| Clyde | 5 | 1959 | 14 | 1971 |
| Third Lanark | 4 | 1963 | 13 | 1962 |
| Queen's Park | 4 | 1946 | 7 | 1985 |
| Cambuslang | 1 | 1888 | — | — |
| Cowlairs | — | — | 1 | 1894 |
Question:
When was the last win of Celtic?
Answer:
2011.0