An environmental sensor records the daily peak UV index over a six-day period. The recorded UV index values are:
8,4,6,2,9,3 8, \quad 4, \quad 6, \quad 2, \quad 9, \quad 3 8,4,6,2,9,3A bubble sort is used to arrange these values in ascending order.
State the number of passes that will be completed to fully sort this list.