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:
| Rank | Name | Nationality | Time | Notes |
| --- | --- | --- | --- | --- |
| 1 | Dyana Calub | Australia | 1:01.77 | Q |
| 2 | Natalie Coughlin | United States | 1:01.99 | Q |
| 3 | Noriko Inada | Japan | 1:02.00 | Q |
| 4 | Haley Cope | United States | 1:02.09 | Q |
| 5 | Diana MacManus | United States | 1:02.10 | Q |
| 6 | Courtney Shealy | United States | 1:02.28 | Q |
| 7 | Aya Terakawa | Japan | 1:02.39 | Q |
| 8 | Giaan Rooney | Australia | 1:02.53 | Q |
| 9 | Erin Gammel | Canada | 1:02.63 |  |
| 10 | Hannah McLean | New Zealand | 1:02.82 |  |
| 11 | Melissa Morgan | Australia | 1:02.86 |  |
| 12 | Reiko Nakamura | Japan | 1:02.91 |  |
| 13 | Michelle Lischinsky | Canada | 1:03.22 |  |
| 14 | Jennifer Fratesi | Canada | 1:03.42 |  |
| 15 | Kelly Stefanyshyn | Canada | 1:03.44 |  |
| 16 | Clementine Stoney | Australia | 1:03.52 |  |
Question:
in the 2002 pan pacific swimming championships women's 100 metre backstroke, how many swimmers finished above japan's aya terakawa in the ranking?
Answer:
6