Where positions get taken in the draft

While every draft is different, what does history tell us on how many of a position gets taken in round 1? Or where the first, second, etc. at a position gets taken?
Below shows historical averages for each position and where they get taken. To orient to the chart:

• The y-axis lists the top ten (1st, 2nd, 3rd, etc.) at a position
• The x-axis is draft location
• The circle is the average pick location for that position (CB1, CB2, etc.) in the draft over the past 5 drafts
• The line shows the range from 25th to 75th percentile picks to give an indication of typical high/low range for the position number (CB1, CB2, etc.)

Below gives detail on the players taken over the past 5 years for the top 10 players taken at each position: