What percent of eligible voters vote in the United States’ national elections?

What percent of eligible voters vote in the United States’ national elections?

Background: It’s election time again, and because we are not electing a new president, this year is what we call the midterms or the congressional cycle. For every election, statistics are collected on the number of eligible voters who actually vote. The graph shows those numbers with green bars representing the percent of people of voting age who voted in the presidential cycles and yellow bars representing the percent of people of voting age who voted in the congressional cycles. (source: US Census Bureau)

Questions: 

1.  Describe what the graph shows about how the number of people voting in presidential cycles differs from congressional cycles, and how voter turnout has changed since 1964.

2. I interpret the graph to mean….  

Attachments: