SAT math OG 2016 - test 4 - Calculator OK

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Questions 21-22 are based on the following passage.

Questions 21 and 22 refer to the following information.
The bar graph above shows renewable energy consumption in quadrillions of British thermal units (Btu) in the United States, by energy source, for several energy sources in the years 2000 and 2010.

Q21 In a scatterplot of this data, where renewable energy consumption in the year 2000 is plotted along the x-axis and renewable energy consumption in the year 2010 is plotted along the y-axis for each of the given energy sources, how many data points would be above the line y = x ?
Q22 Of the following, which best approximates the percent decrease in consumption of wood power in the United States from 2000 to 2010 ?