On Wednesday, 6 September 2017 at 11:14:00 UTC, Maksim Fomin wrote:
On Thursday, 31 August 2017 at 16:37:35 UTC, SrMordred wrote:
On Thursday, 31 August 2017 at 14:57:28 UTC, bitwise wrote:

What happened in 2009?

My guess is constant random methodology changes. I was tracking TIOBE index each month from 2011 till 2016. I remember they announced changes in methodology in title page approximately once per 3-4 months. For example, changing the base from 100% to sum of percentages of all languages(<100%) increased reported % of each language. Taking this into account means that changes in particular month tells nothing. The trend is, however, positive: in 2014-2017 years D stands higher than in 2011-2014 (if you have faith in TIOBE averages). I see sometimes positive discussions about D at completely unexpected local tech sites.

That was my thinking too. A real dip as large as what's shown on the graph for 2009 would probably take 3-4 large companies that use D randomly shutting down in perfect unison - highly unlikely. I think that if the glitch were removed, what would remain would be a nice steady upward slope.

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