Introduction. Beta-blockers, also known as beta-adrenoceptor blocking agents, are medications used to treat conditions such as angina, heart failure and high blood pressure. They decrease the activity of the heart by blocking the action of hormones like adrenaline.
1 The concept of âdemographic changeâ describes a populationâs age structure adjusting to. changes in living conditions. Consequently, changes in thcomposition of a societyâe s age. structure are the result of social shifts. (. 2  cf. . 3  theory of first and second demographic transition.
Population projections compiled in 1988 by the Central Statistical Authority (CSA) projected a 2.83 percent growth rate for 1985-90 and a 2.96 percent growth rate for 1990-95. This would result in a population of 57.9 million by 1995.