Population which number

Bosnia and Herzegovina. Puerto Rico. North Macedonia. Equatorial Guinea. Trinidad and Tobago. Solomon Islands. Western Sahara. Cabo Verde. French Guiana. New Caledonia. French Polynesia. Saint Lucia. Channel Islands. Virgin Islands. Antigua and Barbuda.

Isle of Man. Cayman Islands. Marshall Islands. Northern Mariana Islands. American Samoa. Faeroe Islands. Sint Maarten. Turks and Caicos. From this they can plan and make better decisions regarding the construction of schools, hospitals, roads etc. Governments also need to know how old the population is and will be in the coming years in order to plan for pensions, health care etc.

The population of a given area is defined as the number of people usually living in that area, measured on 1 January in a given year. The source can be the most recent population census a census is when the population is counted. Since a census is normally carried out every 10 years, a yearly adjustment has to be made in order to get the population number for a specific year. This adjustment consists of the natural population change and the net migration.

The natural population change is calculated by births minus deaths and net migration is the number of immigrants population moving into the country minus the number of emigrants population moving out of the country - please see example below. In some countries population registers are used instead.

In the EU on 1 January , the population was estimated at million compared with million on 1 January This means that the population grew by 2 million persons during the year Was this due to natural population change or net migration? The net migration was therefore the reason for the increase.

The fertility rate is the average number of children born alive to a woman taking into consideration current fertility rates. The introduction of agriculture and the gradual movement of humanity into settled communities saw the global population increase gradually to around million by AD 0.

To give you an idea of scale, the Roman Empire, which many regard as one of the strongest empires the world has ever seen, probably contained only around 50 million people at its height; that's less than the number of people in England today. It wasn't until the early 19th century that the world population reached its first big milestone: 1 billion people.

Then, as the industrial revolution took hold and living standards improved, the rate of population growth increased considerably. Over the next hundred years, the population of the world doubled, reaching 2 billion in the late s. The 20th century, however, is where population growth really took off, and over the past years, the planet's population has more than tripled in size. This massive increase in human population is largely due to improvements in diet, sanitation and medicine, especially compulsory vaccination against many diseases.

Most people agree that population increases will continue, but there are arguments about the rate of increase, and even a few people who believe population decreases are likely.

You can see some example trends in this graph. The United Nations has gradually been revising its predictions downwards, and now believes that the world population in will be around 9 billion. It believes that, as the world grows steadily richer and the average family size decreases, growth will steadily slow and eventually stop.

However, others believe that poverty, inequality and continued urbanization will encourage steadily increasing growth, particularly in countries in Africa and parts of Asia , where growth is already much higher than the global average.

A few scientists even believe that populations will decrease. Some believe that gradual increases in living standards will result in similar patterns to those in Western Europe , where birth rates are declining rapidly.

Others believe that the current world population is unsustainable, and predict that humanity will simply not be able to produce enough food and oil to feed itself and sustain our industrial economy. Although the population of the world increases daily, population growth rate has been declining over the last century. The annual growth rate of the world population in is around 1.

Live Population:. World Population Estimator Estimate as of October 23, is:. World Population Clock. Show Source. World Population Prospects: The Revision.

Medium-fertility variant. United States. DR Congo. United Kingdom. South Africa. South Korea. Saudi Arabia. North Korea. Sri Lanka. Burkina Faso. South Sudan. Dominican Republic. Czech Republic Czechia. United Arab Emirates.