The population of the island is believed to have varied from 40,000 to 60,000 in the period ranging from initial settlement until the mid-19th century. During that time, cold winters, ash fall from volcanic eruptions, and bubonic plagues adversely affected the population several times. There were 37 famine years in Iceland between 1500 and 1804. The first census was carried out in 1703 and revealed that the population was then 50,358. After the destructive volcanic eruptions of the Laki volcano during 1783–1784, the population reached a low of about 40,000. Improving living conditions have triggered a rapid increase in population since the mid-19th century—from about 60,000 in 1850 to 320,000 in 2008. Iceland has a relatively young population for a developed country, with one out of five people being 14 years old or younger. With a fertility rate of 2.1, Iceland is one of only a few European countries with a birth rate sufficient for long-term population growth (see table below).