What percentage of land worldwide is used for agriculture? Is this increasing or decreasing?

At present some 11 percent (1.5 billion ha) of the globe's land surface (13.4 billion ha) is used in crop production (arable land and land under permanent crops). This area represents slightly over a third (36 percent) of the land estimated to be to some degree suitable for crop production.

Today, the world population uses approximately 50 percent of total habitable land for agriculture.