Question

global annual wind energy capacity
this graph suggests that from 2008 to 2012, the use of wind power
slightly increased.
slightly decreased.
sharply increased.
sharply decreased.

Explanation:

Looking at the graph, in 2008 the global wind energy capacity is around 22,000 megawatts, and by 2012 it rises to over 45,000 megawatts. This represents a very large, rapid upward change, not a small increase or any decrease.

Answer:

sharply increased.