Yup its been gone for several weeks - now back. Thanks.
I can get it on GF now.
Certainly seems to be one month max - otherwise 10-20% higher..
Also jumps dramatically by September. Weird because I guess that is when they will lose out totally on outbound to HKG with students returning to EU filling Westbound, especially UK universities. Ex EU that month is usually imbalanced especially early month in J.