In 2011, there were 1.92 million absentees (migrants), which represented 7.2 percent of total population of 26.6 million. In 2001, there were 0.762 million absentees (migrants), which represented 3.29 percent of total population of 23.2 million.
Migrant population has drastically increased in the past decade—so has people leaving each year and remittances inflows each year. Slowdown in economic activities, impact of insurgency and low job opportunities are clearly reflected in the figures below.
For more on remittances, see this blog post.