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 | Result | World Rank | Location | Date |
| --- | --- | --- | --- | --- |
| 1973.0 | 45.5 | 9th | Bakersfield | Jun 16 |
| 1974.0 | 45.76 | 11th | Austin | Aug 24 |
| 1975.0 | 45.9 | 30th | Bakersfield | May 17 |
| 1976.0 | 44.82 | 4th | Westwood | Jun 12 |
| 1977.0 | 45.45 | 7th | Zurich | Aug 24 |
| 1978.0 | 45.15 | 6th | Westwood | Jun 10 |
Question:
Which World Rank happened in 1977?
Answer:
7th