The chart below gives the percentage of counties in the US that use various methods for recording votes in 1980 & 2002. Set up side-by-side bar charts by year using the instruction for Side-By-Side Charts in the Class Notes Conference. Copy/Paste your Chart into the TFE Editor from EXCEL.
METHOD 1980 2002
Punch cards 18.5 15.5
Lever machines 36.7 10.6
Paper ballots 40.7 10.5
Optical scan 0.8 43.0
Electronic 0.2 16.3
Mixed 3.1 4.1