context: The stock market collapse of 2007-2009 deeply affected investment income earned abroad. This translated to a substantial fall in the surplus of the current account balance. In 2006, Switzerland recorded a 15.1% per GDP surplus. It went down to 9.1% in 2007 and further dropped to 1.8% in 2008. It recovered in 2009 and 2010 with a surplus of 11.9% and 14.6% respectively.  Unemployment peaked in December 2009 at 4.4%.  In August 2018 the unemployment rate was 2.4%.
question: How many years did the stock market that started in 2007 last?
answer: 2