The trends listed below refer to the proportion of the top 25 tags, as shown in the chart and not the absolute number of questions. You can see these trends by watching the animation and looking at the final chart, repeated below.
- Steady - java, php, python
- Down - c#, asp.net, .net, sql-server
- Tag replacement - ios replaces iphone
I ran a forked version of lukasz.lew's StackExchange Data Explorer Query to collect the data.
Here is the raw data in CSV format. The values in it represent question counts for each month (not a percentage, which can be easily calculated).
Below is the final chart, June 2013.
Thanks to sdfjkl on HackerNews, here's an another chart of the same data set ...
A stacked area chart with time on the x-axis
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