Unemployment peaked just above 10% in 1991 and 1992, following the 1987 share market crash, but eventually fell to a record low (since 1986) of 3.7% in 2007 (ranking third from twenty-seven comparable OECD nations). However, the global financial crisis that followed had a major impact on New Zealand, with the GDP shrinking for five consecutive quarters, the longest recession in over thirty years, and unemployment rising back to 7% in late 2009. Unemployment rates for different age groups follow similar trends but are consistently higher among youth. In the December 2014 quarter, the general unemployment rate was around 5.8%, while the unemployment rate for youth aged 15 to 21 was 15.6%. New Zealand has experienced a series of "brain drains" since the 1970s that still continue today. Nearly one-quarter of highly skilled workers live overseas, mostly in Australia and Britain, which is the largest proportion from any developed nation. In recent decades, however, a "brain gain" has brought in educated professionals from Europe and less developed countries. Today New Zealand's economy benefits from a high level of innovation.