The graph shows the number of computer sold between 2008 and 2016. As an overall trend It can be seen clearly from the sale of computers went down sharply until 2011, remained stable until at 20% in 2012 before rising to 80% in 2014-2015.
In 2008, the number of sales started at approximately 40%. The number rose slowly to 55% by 2010 and then fell sharply to 20% in 2011. At this point the number of sales maintained the same level until 2012 before climbed gradually to 30% by 2013, in 2014 rose rapidly to 80% did not change to 2015. In 2016 fell swiftly to 15%
To sum up, the graph presents the number of computer sold was increased slowly until the 2010, circulation was slumped in 2011, went up quickly in 2014 - 2015. And sales volumes decreased by 15% since 2016, in the middle of an economic downturn.