Politics of Costa Rica approved in 1969 limits presidents and deputies to one term, although a deputy may run again for an Assembly seat after sitting out a term. The prohibition was officially recognized as unconstitutional in April 2004, allowing Óscar Arias to run for President a second time in the 2006 Costa Rican presidential elections, which he won with approximately a 1% margin. The President of Costa Rica has limited powers, particularly in comparison to other Latin American Presidents. For example, he cannot veto the legislative budget, and thus Congress is sovereign over the year's single most important piece of legislation. On the
Costa Rica played a key role in Costa Rica's history and in 2006, was the third cash crop export. As a small country, Costa Rica now provides under 1% of the world's coffee production. In 2015, the value of coffee exports was US$305.9 million, a small part of the total agricultural exports of US$2.7 billion. Coffee production increased by 13.7% percent in 2015-16, declined by 17.5% in 2016–17, but was expected to increase by about 15% in the subsequent year. Costa Rica has developed a system of payments for environmental services. Similarly, Costa Rica has a tax on water pollution to penalize