When UNGA designated 29 June as International Day of the Tropics?

When UNGA designated 29 June as International Day of the Tropics?

Explanation

International Day of the Tropics: 29 June

Aim of the day: to raise awareness of tropical areas

Definition of Tropics: A geographic area that roughly corresponds to the area between the tropics of Cancer and Capricorn

United National General Assembly designated 29 June as International Day of the Tropics: 2016