The population of Italy almost doubled during the 20th century, but the pattern of growth was extremely uneven because of large-scale internal migration from the rural South to the industrial cities of the North, a phenomenon which happened as a consequence of the Italian economic miracle of the 1950–1960s. High fertility and birth rates persisted until the 1970s, after which they started to decline. The population rapidly aged; by 2010, one in five Italians was over 65 years old, and the country currently has the fifth oldest population in the world, with a median age of 46.5 years. However, in recent years Italy has experienced significant growth in birth rates. The total fertility rate has also climbed from an all-time low of 1.18 children per woman in 1995 to 1.41 in 2008, albeit still below the replacement rate of 2.1 and considerably below the high of 5.06 children born per woman in 1883. Nevertheless, the total fertility rate is expected to reach 1.6–1.8 in 2030.