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:
| Fiscal year | 2-car sets | 4-car sets | 6-car sets | 8-car sets | Total vehicles |
| --- | --- | --- | --- | --- | --- |
| 1963.0 | 0.0 | 15.0 | 0.0 | 0.0 | 60.0 |
| 1964.0 | 8.0 | 15.0 | 0.0 | 0.0 | 76.0 |
| 1965.0 | 21.0 | 21.0 | 0.0 | 0.0 | 126.0 |
| 1966.0 | 27.0 | 27.0 | 0.0 | 0.0 | 162.0 |
| 1967.0 | 39.0 | 36.0 | 0.0 | 0.0 | 222.0 |
| 1968.0 | 47.0 | 43.0 | 0.0 | 0.0 | 266.0 |
| 1969.0 | 58.0 | 51.0 | 0.0 | 0.0 | 320.0 |
| 1970.0 | 62.0 | 55.0 | 0.0 | 0.0 | 344.0 |
| 1971.0 | 62.0 | 42.0 | 13.0 | 0.0 | 370.0 |
| 1972.0 | 62.0 | 41.0 | 17.0 | 0.0 | 390.0 |
| 1973.0 | 63.0 | 41.0 | 22.0 | 0.0 | 422.0 |
| 1974.0 | 68.0 | 41.0 | 25.0 | 0.0 | 450.0 |
| 1976.0 | 70.0 | 41.0 | 31.0 | 0.0 | 490.0 |
| 1977.0 | 70.0 | 41.0 | 31.0 | 5.0 | 530.0 |
| 1978.0 | 70.0 | 42.0 | 31.0 | 9.0 | 566.0 |
| 1979.0 | 70.0 | 42.0 | 31.0 | 14.0 | 606.0 |
| 1980.0 | 73.0 | 45.0 | 32.0 | 16.0 | 646.0 |
| 1981.0 | 75.0 | 47.0 | 33.0 | 16.0 | 664.0 |
Question:
What is the largest 6-car-sets for fiscal year 1968?
Answer:
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