The Rwandan government prioritised funding of water supply development during the 2000s, significantly increasing its share of the national budget. This funding, along with donor support, caused a rapid increase in access to safe water; in 2015, 74% of the population had access to safe water, up from about 55% in 2005; the government has committed to increasing this to 100% by 2017. The country's water infrastructure consists of urban and rural systems that deliver water to the public, mainly through standpipes in rural areas and private connections in urban areas. In areas not served by these systems, hand pumps and managed springs are used. Despite rainfall exceeding  annually in most of the country, little use is made of rainwater harvesting, and residents are forced to use water very sparingly, relative to usage in other African countries. Access to sanitation remains low; the United Nations estimates that in 2006, 34% of urban and 20% of rural dwellers had access to improved sanitation. Kigali is one of the cleanest cities in Africa. Government policy measures to improve sanitation are limited, focusing only on urban areas. The majority of the population, both urban and rural, use public shared pit latrines.