Chart assignment
Charts to read and discuss
Read each chart, then answer its questions. Every chart shows its source and date; open it for a table of the numbers and the data to download.
Chart 1 of 2 · NFL
How has your NFL team done each season since 1999?
The interactive chart needs JavaScript. The numbers are on the chart's page.
Choose any NFL team to see its points scored, points allowed and wins each regular season since 1999, next to the NFL average. It opens with the Kansas City Chiefs, who scored 21.3 points a game in the 2025 regular season; their high since 1999 was 35.3, in 2018. Teams that moved include their old cities' seasons (the Raiders' in Oakland, the Chargers' in San Diego, the Rams' in St. Louis), and the Houston Texans start in 2002, their first season. Seasons grew from 16 games to 17 in 2021, so points are per game.
Questions to discuss
- In one sentence of your own, what does this chart show?
- Find the biggest change or difference in the chart. What might explain it?
- Who collected these numbers, and how recent are they? What else would you want to know before drawing a conclusion?
Source: nflverse, NFL schedules and scores (nflverse-data) (CC BY 4.0 (nflverse)) · Data as of Jan 4, 2026
Open the chart and its numbersChart 2 of 2 · Energy
Where does US electricity come from?
The interactive chart needs JavaScript. The numbers are on the chart's page.
In 2025 natural gas made 40.8% of US electricity, followed by nuclear (17.7%) and coal (16.6%). Wind made 10.5% and solar 6.7%. Solar counts only utility-scale plants, not rooftop panels, and the 2025 figures are preliminary.
How to read this chart
Each bar is one energy source's share of all the electricity made in the U.S. in a year, so the bars add up to about 100%. The bars start at zero, so a bar twice as long means twice the share. Solar counts only large power plants, not panels on rooftops.
Questions to discuss
- Which source makes the most electricity? About how many times more than the smallest bar?
- Which of these sources burn fuel and which don't? What share of electricity comes from each group?
- Why might a chart of this kind look different in your state than for the whole country?
Source: U.S. Energy Information Administration, Monthly Energy Review (Table 7.2a) (Public domain (U.S. government work)) · Data as of Dec 31, 2025
Open the chart and its numbersTeachers: make your own chart assignment, or change this one. Free, no account needed.