Want to know why GBPUSD is going downwards today?

Based on the last 12 ISM Non-Manufacturing PMI events in United States, we expect a $320 movement on GBPUSD within 2 hours following the event release at 03 Sep 14:00. We expect GBPUSD to trend downwards 2 hours following the event release at 03 Sep 14:00 if the released value is > 61.5

Historical events that allowed us to draw this conclusion

04 Aug 14:00
03 Jun 14:00
03 Feb 15:00
07 Jan 15:00
05 Oct 14:00