1959 1965 1970 1975 Index 100 130 160 198 f. Building and construction The inadequacy of private housing constitutes one of the most pressing problems facing the country. The Housing Census of 1957-58 revealed that of the 161,000 housing units in Trinidad and Tobago, 69,000 (43 %) were grossly overcrowded, that is, with four or more persons per bedroom. Included in this number were over 43,000 units (27 % of all units) in which there was no separate room for use as a bedroom. The Housing Census also indicated that 66,700 dwelling units or 42 % of the total were neither grossly overcrowded nor of poor quality. Of the remainder, 30,900 units or 19 % of the total were in good condition, but were overcrowded. It may therefore be taken that approximately 63,000 units were in poor condition; that is, they needed to be pulled down and replaced. There was a great deal more overcrowding in "poor" than in "good and fair" units, 60 % of the "poor" units being overcrowded as compared with only 32 % of the "good and fair" units. It has been estimated that a minimum of about 7,000 units are required annually to take care of population growth within the country, but the annual net addition to the stock of housing is only of the order of 2,000 units. The government, in order to alleviate the position, is directly engaged in developing housing schemes and also assists in construction projects, as for instance through aided self help schemes. In addition, various concessions have been offered by the government to enterprises willing to embark upon the construction of houses. In making projections for this sector, the acute housing shortage has been taken into consideration. Construction work done by the sector (excluding construction carried out by government labour and by enterprises on their own account) is expected to be as follows: 1959 1965 1970 1975 Million BWI$ Total 79.2 145.7 194.2 236.9 Households 19.4 37.5 51.2 75.7 Government 15.8 50.9 68.1 64.8 It must, however, be borne in mind that receipts from government are not exclusively used for the construction of housing. The increased activity in the other sectors is likewise reflected in this sector: