Definitions

Life Expectancy:  an expected time to live as calculated on the basis of statistical probabilities. (http://www.google.com/search?sclient=psy&hl=en&q=define%3A+life+expectancy+&aq=f&aqi=g5&aql=&oq=&gs_rfai=&pbx=1)
Crude Birth Rate: Crude birth rate is the nativity or childbirths per 1,000 people per year. (http://www.google.com/search?hl=en&safe=active&&sa=X&ei=G5mkTOXYOYP7lwfe3OyrDA&ved=0CAQQBSgA&q=define%3A+crude+birth+rate&spell=1)

Crude Death Rate: Mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in some population, scaled to the size of that population, per unit time. (http://www.google.com/search?hl=en&safe=active&q=define%3A+crude+death+rate)

RNI: (Rate of Natural Increases.) In demographics, the rate of natural increase (RNI) is the crude birth rate minus the crude death rate of a population. If we neglect the migration, then a positive RNI number means that the population increases and a negative number means that the population decreases. (http://www.google.com/search?hl=en&safe=active&q=define%3A+rate+of+natural+increase)

TFR: (Total Fertility Rate) The sum of the age-specific birth rates of women in five-year age groups multipled by five. This rate estimates the number of children a cohort of 1,000 women would bear if they all went through their childbearing years exposed to the same age-specific birth rates in effect for a particular time. (http://www.google.com/search?hl=en&safe=active&q=define%3A+total+fertility+rate)

Net Migration Rate: Net migration rate is the difference of immigrants and emigrants of an area in a period of time, divided (usually) per 1,000 inhabitants (considered on midterm population). (http://www.google.com/search?hl=en&safe=active&q=define%3A+net+migration+rate)

Population Pyramid: A population pyramid, also called age-sex pyramid and age structure diagram, is a graphical illustration that shows the distribution of various age groups in a human population (typically that of a country or region of the world), which normally forms the shape of a pyramid. (http://www.google.com/search?hl=en&safe=active&q=define%3A+Population+Pyramid)