A bar graph that shows the number of hydrocodone and oxycodone concentrations in the United States from 1991 to 2013. The x-axis represents the years starting from 1991 and ending in 2013 with the y-axis representing the amount of concentrations.
There are three bars in the graph each representing a different year. The first bar is labeled "Total" and shows the total concentrations of the two substances. The second bar is colored in red indicating that the concentrations are higher than the third bar. The third bar is color-coded with blue representing the highest concentrations and green representing the lowest concentrations. The fourth bar is blue representing a lower concentration. The fifth bar is orange representing a higher concentration indicating a higher level of concentration.
The graph also has a legend at the bottom that explains the meaning of each color in the bars. The bars are arranged in ascending order with each bar representing a year from 1991 through 2013.
Description 
Type
Category
Source 1 of 2
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Date
2016
Collection
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Date
2016
Collection
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