Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.

A. It was declared as such by the United Nations General Assembly.
B. Observance began in 1993 and has grown significantly ever since.
C. World Water Day is observed on March 22 since 1993.
D. This day was first formally proposed in Agenda 21 of the 1992 United Nations Conference on Environment and Development (UNCED) in Rio de Janeiro, Brazil.