The Southern province came third at 21.3 percent, up from 21.3 percent helped by manufacturing, construction and government services.
The average national nominal growth rate was 15.9 percent in 2012 down from 16.8 percent in 2011.
The Western province, which is linked with the rest of the world and has the higher population and generates the most economic output share of 43.4 percent, grew at 13.4 percent.
Its share fell to 43.4 percent from 44.2 percent in 2011.
The GDP share of Northern Province rose to 4.0 percent from 3.7 percent, East to 6.3 percent from 5.8 percent, while that of the North Western province fell to 9.6 percent from 10.0 percent from 2011 to 2012.
The share of Central Province was flat at 9.8 percent. The North Central (4.7 percent), UVA 4.5 percent and Sabaragamuwa (6.2 percent) was also flat.(Lanka Business On line)