Trends in Moisture Index, Farmland Area, and Their Combined Effects on Grain Production in Northern China

Table 4

Grain production in the late 1980s and 2008.

Grain production	The late 1980s		2008		Percent increase (%) (late 1980s–2008)
	Tons	Percent (%)	Tons	Percent (%)
Humid zone	122,799,081	77.1	188,532,597	58.9	53.5
Semiarid zone	28,875,900	18.1	115,976,814	36.2	301.6
Arid zone	7,622,100	2.4	15,490,026	4.8	103.2
Total	159,297,081	100	319,999,437	100	100.9