def cumulative_statistics(self):
        """
        Access the cumulative_statistics

        :returns: twilio.rest.taskrouter.v1.workspace.workflow.workflow_cumulative_statistics.WorkflowCumulativeStatisticsList
        :rtype: twilio.rest.taskrouter.v1.workspace.workflow.workflow_cumulative_statistics.WorkflowCumulativeStatisticsList
        """
        if self._cumulative_statistics is None:
            self._cumulative_statistics = WorkflowCumulativeStatisticsList(
                self._version,
                workspace_sid=self._solution['workspace_sid'],
                workflow_sid=self._solution['sid'],
            )
        return self._cumulative_statistics
Access the cumulative_statistics

        :returns: twilio.rest.taskrouter.v1.workspace.workflow.workflow_cumulative_statistics.WorkflowCumulativeStatisticsList
        :rtype: twilio.rest.taskrouter.v1.workspace.workflow.workflow_cumulative_statistics.WorkflowCumulativeStatisticsList