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:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1.0 | Preston North End | 1–1 | Charlton Athletic | 9 February 1946 |
| 1.0 | Charlton Athletic | 6–0 | Preston North End | 14 February 1946 |
| 1.0 | Preston North End | 1–6 | Charlton Athletic | Charlton Athletic |
| 2.0 | Bolton Wanderers | 1–0 | Middlesbrough | 9 February 1946 |
| 2.0 | Middlesbrough | 1–1 | Bolton Wanderers | 13 February 1946 |
| 2.0 | Bolton Wanderers | 2–1 | Middlesbrough | Middlesbrough |
| 3.0 | Sunderland | 1–0 | Birmingham City | 9 February 1946 |
| 3.0 | Birmingham City | 3–1 | Sunderland | 13 February 1946 |
| 3.0 | Sunderland | 2–3 | Birmingham City | Birmingham City |
| 4.0 | Queens Park Rangers | 1–3 | Brentford | 9 February 1946 |
| 4.0 | Brentford | 0–0 | Queens Park Rangers | 14 February 1946 |
| 4.0 | Queens Park Rangers | 1–3 | Brentford | Brentford |
| 5.0 | Barnsley | 0–1 | Bradford Park Avenue | 9 February 1946 |
| 5.0 | Bradford Park Avenue | 1–1 | Barnsley | 13 February 1946 |
| 5.0 | Barnsley | 1–2 | Bradford Park Avenue | Bradford Park Avenue |
| 6.0 | Brighton & Hove Albion | 1–4 | Derby County | 9 February 1946 |
| 6.0 | Derby County | 6–0 | Brighton & Hove Albion | 14 February 1946 |
| 6.0 | Brighton & Hove Albion | 1–10 | Derby County | Derby County |
| 7.0 | Chelsea | 0–1 | Aston Villa | 9 February 1946 |
| 7.0 | Aston Villa | 1–0 | Chelsea | 12 February 1946 |
| 7.0 | Chelsea | 0–2 | Aston Villa | Aston Villa |
| 8.0 | Stoke City | 2–0 | Sheffield Wednesday | 9 February 1946 |
| 8.0 | Sheffield Wednesday | 0–0 | Stoke City | 11 February 1946 |
| 8.0 | Stoke City | 2–0 | Sheffield Wednesday | Sheffield Wednesday |
Question:
What is the average Tie no when the date is Birmingham City?
Answer:
3.0