The chart below starts with data at end of July 31, 2017 at the masthead
The latest customer for ten Max were ordered by Japan Investment Adviser Co. Ltd as reported by Boeing's website.
The detail between the 737 NG and Max units is interpolated from Boeing data when backing into a breakout of NG orders vs Max orders which is not provided on Boeing's summary in an out right fashion. Using YTD Boeing information from a model by model gross order count and then applying any reported changes from Boeing reaches a net number by type.
In other words, it becomes a detective like pursuit to find out how many net NG's or Net Max are on order when using Boeing publicized minimal data concurrently with any changes to its order book summary.