Very nice milestone!
I was going to try comparing to this site but I don't know how to find LTD numbers by country on here anymore.
Using the Yearly Chart and the Hardware Comparison tools I ended up with this for the US:
End of 2018: 28.248.598
Jan-Aug 2019: 1.733.071
Total: 29.981.669 (as of 31st August 2019)