The population of India is irrelevant, the India Desktop PC market only accounts for approximately 13.9 million users total. Linux holds 15.64% in India, therefore 15.64% of 13.9 million is only approximately 2.17 million, which again does not account for the 12+ million increase of users.
The global desktop OS market is estimated to be 1.23 billion users total.
The Linux desktop OS market share is 4.3% of 1.23 billion which is approximately 49.3 million users. 1% of 1.23 billion is 12.3 million, therefore Linux grew 12.3 million in the last 8 months.
India only accounts for 2.17 million of the 49.3 million global total.
If Linux adoption grew to 16% in India that’d only be a 53.24 thousand increase.
Again, you have a complete lack of understanding of how percentages work.
Edit : actually I miss calculated because Linux is apparently 4.05% now, not 4.03%. that grew really fast.