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.
1 Year Change: Percentage change in total population over the last year (from July 1, 2013 to June 30 2014). Population Change: Absolute change in total population (increase or decrease in number of people) over the last year (from July 1, 2013 to June 30 2014).