I tēnei wā ka hora te hiko karihi, tata ki te 15.7% o te hiko o te ao (i te tau 2004) ā, ka whakamahia ki ngā kaikawe waka rererangi whakanui, ngā kaiwawao me ngā waka whakarewa (nā te mea kua āraia te whakamahinga o te hiko karihi me ētahi tauranga i roto i ngā kaipuke waka).