Investment in housing and for social and cultural purposes has been minimal--8.1 and 3.7 percent, respectively, in the 1961-65 period and 6.1 and 8.1 percent, respectively, under the plan for 1966-70. As in the case of agriculture, actual investment in 1966-67 was substantially below the planned levels and amounted to less than 5 percent for housing and 2 percent for social and cultural needs. This capital starvation has been largely responsible for the dismal housing situation and for the inadequacy of other essential amenities. Money and Banking The lek, divided into 100 quintars, is a nonconvertible paper currency with multiple official exchange rates. The basic official rate since August 10, 1965, has been 5 leks for 1 United States dollar, a rate that has no applicability in practice. Up to 1965 the exchange value had been 50 leks per US$1. The change in par value had no economic significance because prices, wages, and all other monetary values were reduced by the same ratio. There are two types of so-called tourist or support leks. A rate of 12.50 leks per US$1 applies to the official exchange of Western currencies by nonresidents and to support payments received by residents from Western sources. A rate of 7.55 leks per US$1 applies to the exchange by Communist country residents of their national currencies and to support and other noncommercial payments transferred by them from Albania to Communist states. A third variety of official exchange rates consists of the rates used to balance clearing accounts under special trade and payments agreements with Communist countries. An illegal black market rate of about 60 leks per US$1 from early 1968 through early 1969 was reported by reliable sources. All currency matters are administered by the National Bank jointly with the ministries of finance and trade. Albania is not a member of the International Bank for Reconstruction and Development or of the International Monetary Fund. Adequate information is not available on the nature of the relationship between the State Bank and the Ministry of Finance or on the bank's financial operations beyond some outdated statistics on credits and savings deposits. As the principal financial institution, the State Bank carries out the financial policies of the Party and government. It issues currency, provides credit to all economic sectors, accepts savings deposits, and serves as the country's treasury. In addition to these functions, the State Bank helps prepare the financial plans for the economy, is called upon to assist enterprises in completing their planned assignments, and is responsible for controlling all economic activities through the use of its financial levers.