While the trend data shown is correct in theme, the data provided in the source link is incorrect. For example, the totals for 2016 AP CS students in your source doc shows the total as 54,379 taken, with 12,642 female test takers. If you go to the AP website (https://secure-media.collegeboard.org/digitalServices/pdf/research/2016/Program-Summary-Report-2016.pdf) , they list a total of 57,937 taken with 13,506 test takers. Were your numbers derived from a different location? Is it possible that the numbers have changed on the AP site? This trend is repeated, with your numbers lower than those provided by the AP site for each year. Again, this doesn’t effect the message you are portraying, but if you are providing data, I would hope that you want correct data.