The given pie chart demonstrates the change in the global market share of three computer systems, OS1, OS2, OS3, over the three-year period from 2012 to 2015.
From an overall perspective, the market share of OS1 declined significantly; by contrast, a drastic improvement can be noted in the market share of other operating systems from 2012 to 2015. Meanwhile, there was no notable change in the market share of OS2 and OS3 during the period under consideration.
As per the 2012 pie chart, the highest market share of 48% was held by OS1, and it fell to 35% in 2013. It further decreased to 35% in 2013 and to 23% in 2014 and recorded the lowest percentage of 15% in 2015. In contrast, other operating systems recorded a market share of 20% in 2012 and it significantly increased by 18% to 38% in 2013. Moreover, it exhibited a further growth of 9% in 2014 to 47% and recorded the highest percentage of 52% in 2015.
Hence, OS1 lost its market share by 33% from 2012 to 2015. By contrast, other operating systems gained market share by 32% over the three years. OS2 and OS3 operating systems maintained their shares with mild fluctuations over 2012–2015.