Here's the June 2015 spreadsheet report and regional quarterly yield map.
From now on the spreadsheet reports will be published quarterly to free up some staff time to spend on analysis and website development. I've made some changes to the spreadsheet such that it now includes the last 15 months of data so that year-on-year comparisons are still possible for the months in between reports. I've also updated the year-on-year comparison graph to use quarterly statistics rather than monthly. If anyone spots any errors or mistakes please let me know in the comments.