As of July 2015, the world population was estimated to be greater than 7.2 billion. The most populous country was China, with more than 1.3 billion people, followed by India, with more than 1.2 billion people. The third most populous country was the United States, but with a considerably smaller population of 321,362,789.
The total number of people who have ever lived on Earth was estimated by Carl Haub in 2011 to be 108 billion. The current population represents a considerable portion (6.5 percent) of that figure.
The world population has exponentially increased since the 18th century, prior to which population growth was comparatively very slow. During the course of the 20th century, the growth of the world's population, from 1.5 billion to 6.1 billion, is three times greater than it was over the course of all human history before that point. Since 1964, when population growth peaked at a rate of 2.4 percent per year, the growth of the world's population has been slowing down.
Countries that have recorded diminishing populations between 2010 and 2014 include:
- Albania (2,913,021 in 2010 to 2,894,475 in 2014)
- Bosnia and Herzegovina (3,845,929 to 3,824,746)
- Cuba (11,281,768 to 11,258,597
- Estonia (1,331,475 to 1,313,645)
- Greece (11,153,454 to 10,957,740)
- Hungary (10,000,023 to 9,861,673)
The United States population, however, continues to increase at a rate of one person every 12 seconds, according to the official Census website.