recently did some math AVERAGING, contrasting & comparing for yields over last 20 yrs

then, i broke last 10 in 2 halves.

results = avg yield over last 10 = about 150.9. ... '94-'03 avg = 132+
** '04-'08 yield avg slightly higher than last 5, so trend last 10 is flat to down, before 2014 yield. anything above 160 this yr will bump 10 yr trend ever so slightly up.

for those who don't think 30, 40 or 50 yrs is enough data for a trend, here is 147 yrs courtesy of NASS:

http://quickstats.nass.usda.gov/data/printable/E593C02F-7AB7-346B-B986-A4D3C0CA163B