They have changed way how is index compute. They do this many times in history,  so there is almost zero value in this graph

Dne 31. 8. 2017 6:42 odpoledne napsal uživatel "SrMordred via Digitalmars-d-announce" <digitalmars-d-announce@puremagic.com>:
On Thursday, 31 August 2017 at 14:57:28 UTC, bitwise wrote:
https://www.tiobe.com/tiobe-index/d/

What happened in 2009?