ʻI he ngaahi taʻu 1960 naʻe liliu ʻa e ngaahi fonua ki he founga fakamita, ʻa ia ʻi 1967 naʻe toʻo ʻi Tonga ni ʻa e ngaahi sōvaleni mo e silini (20 ʻi ha sōvaleni ʻe 1) mo e peni (12 ʻi ha silini ʻe 1), pea naʻe hū ʻa e paʻanga mo e seniti (100 ʻi he paʻanga ʻe 1). Naʻe tatau ʻa e seniti ʻe 10 ki he silini ʻe taha, ʻa ia naʻe tatau foki ʻa e sōvaleni ʻe 1 ki he paʻanga ʻe 2. Naʻa nau ʻasi ʻa e ʻata ʻo Sālote Tupou III, pea Tāufaʻāhau Tupou IV mei he 1974. Naʻe ʻi ai ha ngaahi laʻi ʻi he