How is the econoney in Guyana?

In 1972 Guyana's economy started to deteriorate before that is was 2:1 comparing Guyana to the US but now, its 198:1

its came from being the richest Latin country to the second poorest and now is the 3rd Latin American country (Haiti, Nicaragua the poorest) but Guyanese govenment believes they will be fully developed in 2020
the same as Jamaica