Carbon County has long been considered a bellwether county for Pennsylvania statewide elections. In gubernatorial elections, it has been perfect since 1952.  At the presidential level, Carbon County was also a bellwether for Pennsylvania (although not the nation) until recently, with only 1 miss (in 1960) from 1916 to 2000, and with a margin within 3.5 points of the statewide margin in every election from 1940 to 2000 except 1964 (5.3% more Democratic) and 1976 (6.9% more Democratic). However, since then the county has trended Republican relative to the state as a whole, with McCain outperforming in Carbon by 8.5% relative to the state and Romney outperforming by 12.9%. Republicans hold the commissioner majority while Democrats hold all county row offices. Al Gore carried it in 2000, and in 2004, Republican George W. Bush defeated Democrat John Kerry 49.99% to 48.81% or a margin of 296 votes.
Question: How many more percent of voters in Carbon County voted Democratic in 1976 than in 1964?
Answer: 1.6