what is the forecasting method for this figure?

A Desktop Operating Systems Out of hundreds of operating systems developed, only few are very successful. Two operating systems initially dominated the personal computer and workstation: Microsoft's MS-DOS and UNIX. Later on there is a series of Windows based and UNIX based operating systems [13]. For Desktop Operating Systems, the data is extracted from W3Schools' log-files, over an eleven year period and on a yearly basis, spanning from 2003 to 2013 [18]. Figure 1 shows the forecasted results for operating systems technologies. 100 BO 60 Market Share (5) 40 - Windows Actual - Windows Forecasted - LINUX actual - LINUX Forecasted MAC actual - MAC forecasted 20 0 - 2008 2010 2020 2022 2024 2026 2012 2014 2015 2018 Year Fig.1. Forecasted Results for Operating Systems Technologies. Microsoft Windows Operating System has captured more than 90% of the market share but it seems to be slightly declining in coming future. MAC Operating Systems are growing rapidly in market being second in usage market share. The Linux Operating system is growing slowly than MAC OS in market even it came