1 in 4000

Where did you get the number? For example, Rosalind's Top 100 shows the following numbers¹:

44      Python
18
10      C++
6       Ruby
4       C#
3       R
3       Perl
2       Java
2       MATLAB
2       Go
2       Haskell
1       C
1       PHP
1       Common Lisp
1       Scala
[download]

Update: Also, Contest Coding had 4/23 Perl participants (one of them used Java, too), submitting 98/404 solutions.

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¹If scraped a big.