Approximately 90 million people added to world population, which reached 6 billion. This is equivalent to adding an annual population equal to that of Great Britain, Belgium and the Netherlands in world population.
World’s population has never been so numerous as today, and the growth rate of around 1.7% per year, was not so great. The current population explosion growing pressure exercised on earth’s limited natural resources.
The population grows when actual birth rate is higher than mortality. The difference between the two is the natural rate of population demographic. In a country where the birth rate is 20 per 1000 and the mortality of 10 to 1000, natural growth rate is 10 per 1000 people, or 1%.
Experts estimate that the 5.4 billion living in 1991, accounted for 6-7% of all people who ever lived. Of course before 1800 demographic estimates are only approximations. But even today, many areas related to population figures are often inaccurate. However, experts have determined the curve of population growth on the planet. An important period of the population was around 8000 BC more like the period is linked to the discovery of agriculture and the establishment of permanent human settlements. From a population of about 5 million in 8000 BC, the numbers have gradually increased, doubling every 1500 years, for it in 1650 to reach 500 million people. The average growth rate reached only 004 to 0.06% per year, reflecting the fact that life was hard and infant mortality, hunger, disease, natural disasters and wars have decimated the population. Between 1650-1850, world population has doubled, reaching 1 billion. Doubling time was reduced so years from 1500 to just 200 years and the growth rate of 0.3-0.4% per year achieved.
The continuous increase of the population by 1800 was practically a result of developments in agriculture and health and hygiene but also because of economic and social changes have raised the standard of living much, especially in Europe and North America.
The main period of population growth, population outside of Europe and North America, started not until the 1920s. This coincided with a decrease in population growth in Europe and North America. From anii1950, population growth rate of the richest countries was about 1.5% per year, compared with more than 2% of the poorest countries of Africa, Asia and South America.
For people in Europe and most of those of European descent in the world, the last 500 years have brought major changes. On average, families have halved the number of members and the average life expectancy of a newborn child has increased from 35 years, as it was in 1750, to 75 years today.
In most developing countries has increased and life expectancy. But is still much lower than in developed ones. Life expectancy at birth stands at 53 years in Africa, 61 in Asia and 67 in Latin America.
Lower mortality rates in developing countries, whose population was in the early 1990s about 77% of world population, are the result of improvements in medical care than social or economic exchange. The birth rate remained high, especially in rural communities. For example in Kenya has halved the death rate between 1965-1989, while population growth rate increased in the early 1980s, an average of 3.8% per year. They have made the population doubling time of Kenya to fall to less than 20 years.
The proportion of people under 15 years in developing countries is 37% and only 4% of persons over 65 years. In developed countries, people under 15 years is 22% and those aged over 65 represent 11% of the total population.