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:
| Year | Start | Qual | Rank | Finish | Laps |
| --- | --- | --- | --- | --- | --- |
| 1948 | 21 | 127.968 | 6 | 5 | 200.0 |
| 1949 | 14 | 128.260 | 11 | 16 | 172.0 |
| 1950 | 26 | 130.687 | 20 | 13 | 132.0 |
| 1951 | 23 | 132.925 | 22 | 31 | 18.0 |
| Totals | Totals | Totals | Totals | Totals | 522.0 |
Question:
What is the average number of laps in 1949?
Answer:
172.0