public function getTopContributors($parentObject, $options = [])
    {
        $individualType = Yii::$app->collectors['types']->getOne('Individual')->object;
        $individualModelClass = $individualType->primaryModel;
        $individualModelAlias = $individualModelClass::modelAlias();
        $taxonomyType = Yii::$app->collectors['taxonomies']->getOne('ic_time_individual_role');
        $taxonomy = $taxonomyType->getTaxonomy('contributor');
        $limit = isset($options['limit_contributors']) ? $options['limit_contributors'] : 5;
        $query = $this->getBaseStatsQuery($parentObject);
        $query->join('LEFT JOIN', Relation::tableName() . ' r2', 'r2.child_object_id=innerQuery.id');
        $query->join('LEFT JOIN', Registry::tableName() . ' reg', 'r2.parent_object_id=reg.id');
        $query->join('LEFT JOIN', RelationTaxonomy::tableName() . ' tax', 'r2.id=tax.relation_id');
        $query->select(['r2.parent_object_id', 'SUM(`hours`) as sum']);
        $query->groupBy(['r2.parent_object_id']);
        $query->andWhere(['reg.object_model' => $individualModelAlias]);
        $query->andWhere(['tax.taxonomy_id' => $taxonomy->primaryKey]);
        $query->addOrderBy(['SUM(`hours`)' => SORT_DESC]);
        $query->limit($limit);
        $c = [];
        foreach ($query->each() as $row) {
            $individual = Registry::getObject($row['parent_object_id']);
            if (!$individual) {
                continue;
            }
            $c[$row['parent_object_id']] = [
                'label' => $individual->descriptor,
                'sum' => $row['sum'],
            ];
        }

        return $c;
    }