While the 2014 FATCA information transfer to the IRS was widely reported, since then we have had no idea how much data has been flowing from the ATO to the IRS. To get a better idea of the scope of the data exchange, Carl sent an FOI request to the ATO for a summary of the data sent to the IRS under FATCA for all three reporting years that have now been completed (2014, 2015, and 2016). The ATO complied with this request in a timely manner, sending us a pdf file of a printout of an excel worksheet that spans several pages both vertically and horizontally. 
FATCA requires Australian financial institutions (very broadly defined) to report account holder details as well as account balance, dividends, interest and other income paid, and gross proceeds from sale or redemption to the ATO for transmittal to the IRS. It is evident from the graphs below that the amount of data going to the IRS has exploded since the initial data transfer of 2014 data (transferred 30 Sept 2015).