user: Question: How many years for the team with under 31 ties and a percentage of 0.5451?
Columns: ['Mountain West', 'Lost', 'Tied', 'Pct.', 'Years', 'Total Games']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Boise State', 148.0, 2.0, 0.723, 45.0, 538.0]
SQL:

assistant: SELECT "Years" FROM "Table" WHERE "Tied" < 31.0 AND "Pct." = 0.5451;