Table: yorkshire_2008_cricketers
Columns: player
matches
innings
not_out
runs
high_score
average
strike_rate
100s

Question: What was Matthew Hoggard's high score when he had a strike rate of n/a?
SQL: SELECT "high_score" FROM yorkshire_2008_cricketers WHERE "strike_rate" = 'n/a' AND "player" = 'matthew hoggard'