CREATE TABLE table_22551 ("Nation" TEXT, "Rider" TEXT, "Horse" TEXT, "Cross Country Penalties" TEXT, "Total Penalties" TEXT, "Total Team Penalties" TEXT, "Team Rank" FLOAT)

Which nation is where rider phillip dutton from?
SELECT "Nation" FROM table_22551 WHERE "Rider" = 'Phillip Dutton'
SELECT "Nation" FROM "table_22551" WHERE "Rider" = 'Phillip Dutton'