RPKI coverage statistics

Hi All, where can I found the current coverage of IP prefixes under RPKI system. Stats like total prefixes issued collectively by all the organisations like RIR's/IANA/ISP's. stats like prefixes coverd under RPKI system. The goal is to detect the BGP IP prefix hijacking using RPKI system. I would like to know the coverage before adopting RPKI system. I would like to know the suggestions from the community on using this system. Regards, Nagarjun