You're right, I didn't notice the date.
Here's a current Rasmussen report.
In May, the number of Republicans in the country increased to its highest level so far this year.
Now, 35.6% of American Adults consider themselves to be Republicans, up from 34.8% in April.
The number calling themselves Republicans peaked most recently last December at 37.0% but began to decline after that.
The number calling themselves Democrats increased slightly from 33.5% in April to 34.0% last month.
Democrats hit a recent high of 36.3% last October just before the midterm elections.
After four straight months of increases, voters who say they are not affiliated with either party fell back to 30.4% in May from 31.7% the month before.
For Republicans, the peak was way back in September 2004 at 37.3%. Since then, until recent months, the number of Republicans has generally stayed between 31% and 34% of the nation’s adults.
Keep in mind that figures reported in this article are for all Adults, not Likely Voters.
http://www.rasmussenreports.com/public_content/politics/mood_of_america/partisan_trends