Read the passage below carefully and evaluate the statement that follows:
Established on May 22, 1964, by the Fort-Lamy Convention, the Lake Chad Basin Commission (LCBC) was created by four border countries: Cameroon, Chad, Niger, and Nigeria. Central African Republic joined the commission in 1994, and Libya subsequently acceded in 2008. Headquartered in N'Djamena, the commission's primary mandate is to manage the sustainable and equitable use of Lake Chad and its water resources. Funding for the commission's operational budgets is sourced primarily from annual member-state contributions, calculated based on each country's economic indicators, rather than external donor grants or commercial water tariffs. In 2012, member states adopted a comprehensive Water Charter to regulate transboundary water allocation and preserve the basin's fragile ecosystem.
Statement: According to the passage, the operational budgets of the Lake Chad Basin Commission are mainly financed through commercial water tariffs and external donor grants.
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