38% ngā penapena pūngao mā ngā pēke pūngao resonant mō te pūnaha hiko o te whakamahana arataki, te rewa, te whakarewa, te whakarewa, te whakamahana, te hanga me ētahi atu. Mā ngā pūngao kounga teitei ka whakarite i te pūnaha hiko mahi teitei i roto i ngā whare hanga whakarewa.