Neural Network Results

I am trying out some software which builds a neural network from a dataset. It looks for connections---like our own brains. I used the data Malcolm has been working on for three counties. The results look like this:

Variable Impact Analysis     wheatyieldn100 47.3206%     mktdist 25.1332%     barleyyieln100 8.3316%     oatsyieldn166 8.3279%     elevation (m) 5.4441%     mktpop 4.9268%     grassland 0.4124%     arable 0.1035%
It is a surprise to me that distance from the market town is so important---I'll run the test again for different counties.