Transit Time Benchmark

Hi All,

I am trying to create a dashboard which compares actual Transit time against a benchmark transit time per lane. 

Actual Transit time from Kobe to Los Angeles, CA= 18 days

Benchmark Transit time Kobe to Los Angeles, CA= 15 days

Actual Transit time from Nansha to Seattle, WA= 25 Days

Benchmark Transit time Nansha to Seattle, WA=31 Days

Instead, my benchmark times are showing the same time for all of the ports. 

Benchmark Transit time Nansha to Seattle, WA=31 Days

Benchmark Transit time Nansha to Los Angeles, CA=31 Days

Benchmark Transit time Nansha to Long Beach, CA=31 Days

Benchmark Transit time Nansha to Chicago, IL=31 Days

It applying the average of all the ports collectively. My tables are linked based on a Origin&PortofArrival key. I have a table of all the actual data and another table of strictly benchmark data