如何判断Azure存储帐户的完整程度？

Is there any way of determining the used and/or remaining capacity of an Azure Storage account? I know that the current size limit is 100TB per storage account and I'm looking for either number of bytes used/remaining or, failing that, percentage used/remaining. However I can't see any way of monitoring this even in the Azure portal, let alone doing it programmatically via the API.Is there any way of determining the used and/or