Compare this to the production of wheat in the years from 1999 to2007?

(Note that we'll focus on grain production as an indicator of how we are doing in food production because grains supply almost more than half of humans' intake of calories and protein directly, because grain is often used to feed livestock (which consumed ~40% of global corn production alone as of 2010 -- nevermind livestock's consumption of global soy, which was about 80% as of 2010 [Vital Signs 2011]) and collectively, these two (grain and livestock) provide about 80% of the world's food supply. Further, about half of the global crop acreage is planted to grains. Thus, we use grain production as a surrogate for production trends in other agricultural commodities as well. Corn, wheat and rice constitute about 85% of the total global grain production and, amazingly, rice alone provides about 20% of humanities caloric intake [Science 18 July 2008].)

Explanation:

the climate of each region is different from one another.