[ice_man]

If the numbers in these charts are relative to the total number searches on Google, then it could just mean that the ratio of programming searches to non-programming searches is decreasing, (i.e. if more non-programmers are using Google, or if people don't use their phones to search for programming-related concepts on Google.)

[fauigerzigerk]

I think you're absolutely right. I've been thinking the same ever since I started to look at programming language usage on google trends and found that almost all of them are going down most of the time.