And here I thought you just really liked books... 😉
You won't be able to do this for the last year... But if you use the Summary Reports page under Organization > Summary Reports you can pull 6 month intervals and add them together.
I'm not sure if this will do... But it might be as close as you can get. The other option would be to call Meraki support and ask them to pull that data for your fiscal year (I don't know if they can... But worth asking).