OK, so I felt bad about not actually answering your question, so here you go (generated by the method outlined below):
#Sequence GC content
The GC content of human chromosomal DNA is very heterogeneous, rendering chromosome-wide statistics relatively meaningless. It has been shown that the human genome is a mosaic of GC-rich and GC-poor regions, of around 300kb in length, called isochores.
You can plot these regions of varying content using the Emboss program
isochore. For example, for chromosome 1.
isochore -sequence chr1.fa -outfile chr1.isochore -graph png
Gives the following result:
You could also get the sequences of the individual chromosomes and work out their overall GC content, also using Emboss, this time
geecee -sequence chr1.fa
Gives us an answer of 43% for Chromosome 1.