An automated quality-control system records the thickness of seven glass panels in millimetres as follows:

| 8.1 | 1.2 | 5.4 | 9.3 | 2.7 | 6.5 | 3.8 |

A bubble sort is used to sort this list of measurements into ascending order.

State the number of swaps that will be made during the first pass of the algorithm.