The Oregon Secretary of State has released registration data as of June 15. See here.

The percentages of voters by party are now: Democratic 39.30%, Republican 30.90%, non-affiliated 22.61%, Independent Party 4.44%, Libertarian .71%, Pacific Green .48%, Working Families .31%, Constitution .16%,, Progressive .09%, Americans Elect .01%, miscellaneous 1.00%.

As of December 15, 2012, the percentages were: Democratic 39.58%, Republican 31.04%, non-affiliated 22.39%, Independent Party 4.34%, Libertarian .70%, Pacific Green .49%, Working Families .20%, Constitution .15%, Progressive .09%, Americans Elect .003%, miscellaneous 1.02%.

The Independent Party will have its own government-administered primary if it can get its registration up to 5%. The Americans Elect Party will probably lose its qualified status in August 2014; the only thing that could keep it on for the 2014 election would be an increase in its registration to at least .5%. Thanks to Michael for the link.