This tends to dilute responsibility for tariff-making, and does not contribute to well-balanced relations between private operators and municipal, regional or federal authorities. To address the issue, recently the decision was taken to transfer responsibility for tariff setting from local level to subjects of the federation, except for big municipalities. As of 2008, private operators delivered water supply and sanitation services to 20.5% of residents of these countries, which is considerably higher than the world average (it is estimated that private operators serve about 10% of the world population).