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:
| Class | Type | Introduced | Fleet Size | Numbers |
| --- | --- | --- | --- | --- |
| Class 08 | Shunter | 1953 | 2.0 | 08925, 08934 |
| Class 09 | Shunter | 1959 | 2.0 | 09002, 09009 |
| Class 20 | Diesel locomotive | 1957-1968 | 9.0 | 20096, 107, 142, 189, 227 311, 314, 901, 905 |
| Class 66 | Diesel locomotive | 2002 | 48.0 | 66701-733, 735-751 |
| Class 73 | Electro-diesel locomotive | 1966 | 10.0 | 73119, 141, 204-209, 212-213 |
| Class 92 | Electric locomotive | 1993 | 7.0 | 92020, 021, 032, 040, 044-046 |
| Vanguard 0-6-0DH | Diesel locomotive | 2011 | 2.0 | DH50-1, DH50-2 |
Question:
What is the average fleet size for the Shunter type introduced in 1959?
Answer:
2.0