It is narrated from Tawus and Ikrimah (may Allah have mercy on them both) that Sayyiduna Umar (may Allah be pleased with him) ruled half the blood money for an ear, and Ma'mar (may Allah have mercy on him) says that Sayyiduna Abu Bakr (may Allah be pleased with him) had ruled 15 camels.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16222