implemented per_asset_value()
implemented per_asset_value()


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Former-commit-id: 4221d910b1ec20dfba69cb28049336fc91198e90
Former-commit-id: c0206a353ba72aded9a0f41c21c7697a8aae9fc5
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine