The given pie charts compare the market shares of the three computer operating systems with those of others from 2012 to 2015.
Overall, while the market ratio of other operating systems presented a downward tendency over the period in opposite to that of the first system, the shares of the second and third systems remained stable over the points of years.
As is shown in the graphs, the initial proportion of other operation software (48%) was about twofold higher than the figure for the first one, at 20%. However, that market share gap was bridged dramatically in 2013 when the percentage of the sales of the first software increased sharply to 38%, while that of others experienced a drop of 13%. Similarly, in 2014 and 2015, the market share of the first operating system registered continuous growth to 47% and 52%, respectively, despite the figures for others decreasing gradually to 23% in 2014 and terminating at 15% by 2015.
In terms of less dynamic categories, the market ratio of the second operating software dramatically dropped to 10% by 2013 before gradually climbing to its starting point in 2015. In contrast, the market share of the third system remained unchanged over a two-year period and then slightly increased to 18% in the last two years.