Chiapas accounts for 1.73% of Mexico's GDP. The primary sector, agriculture, produces 15.2% of the state's GDP. The secondary sector, mostly energy production, but also commerce, services and tourism, accounts for 21.8%. The share of the GDP coming from services is rising while that of agriculture is falling. The state is divided into nine economic regions. These regions were established in the 1980s in order to facilitate statewide economic planning. Many of these regions are based on state and federal highway systems. These include Centro, Altos, Fronteriza, Frailesca, Norte, Selva, Sierra, Soconusco and Istmo-Costa.