C, C++ job has 850 posting, for New York area
C# job has 900 posting, and in the same range as C, C++.
Java job has 2000 more jobs.
But if you know how the C#, or Java is compiled to Binary code. You will know that C, and C++ will never get out off computation, even the FORTRAN will not get out off computation. There are only two compiler can compile your code to binary. they are C compiler and Fortran compiler.
your Java code compiled in this path, Java/C# to C/C++ code, then C++ code to C/Fortran code, then to C/Fortran binary compiler will give you the binary code.
I know that you will say that Java/C# is interpreter program, that is why Java/C# is slow, while C/C++ all are compiler program, they are faster. you will say that Java is faster now, but all the multy threading compiling code is running in binary code written in C/C++.
I have a C Compiler book, bought twenty yeas ago and still values at the original price.
All the famous programs compitation contest are in C/C++, certainly Java is allowed to enter into the contest, but in most cases, C/C++ will win the title.