The Oregon Secretary of State recently released the September 2015 voter registration data by party. See it here.

The new percentages are: Democratic 37.83%; Republican 29.65%; Independent Party 5.07%; Libertarian .81%; Working Families .54%; Pacific Green .45%; Constitution .17%; Progressive .09; Americans Elect .02%; other parties .93%; independent voters 24.44%. Americans Elect is no longer ballot-qualified, but Oregon law says recently disqualified parties continue to receive a registration tally for one more election, to see if they can get enough to re-qualify.

A year ago, the percentages were: Democratic 38.12; Republican 30.17%; Independent Party 4.82%; Libertarian .79%; Pacific Green .47%; Working Families .43%; Constitution .16%; Progressive .09%; Americans Elect .02%; other parties .98%; independent voters 23.94%.

Here is a news story about the Independent Party, which focuses on the new registration data.