That’s not my experience. (Perhaps a different version of dcraw? I use v9.27, slightly hacked by me, but I’ve heard version numbers are not always incremented.) I get:
Red: 0.64843207589456,0.330852728980697
Green: 0.32115496490425,0.597872320134279
Blue: 0.155883679164759,0.0660447944681277
WP: 0.345689445525292,0.358517931734951
As this uses ICC, only the first four digits or so are significant. This WP corresponds to illuminant D50 with 2° field of view, more or less.
(Incidentally, the field of view is another potential source of difference. This is usually 2 degrees, but can be 10 degrees, which gives different numbers.)