Hourly earned vs. Years of schooling

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12 years is equivalent to finishing high school
16: finish college
20: finish graduate school (PhD)

Some of my interpretations:

• Majority of people who finish high school will perform as well as majority of those just finish college (12yr vs. 16yr).
  
• Some drop-outs from colleges do quite well (13 years, we also know some famous examples)
  
• Best-doers in colleges seem to get highest pay (highest point in 16 year column)
  
• Masters have minor advantage, you should have just stop at high school instead :))
  
• PhD definitely do better than all those who just halfway in secondary school (7 years). Congratulations!
  
• Smartest PhD can't beat smartest bachelor.
  
• Drop out late in your PhD is expensive (you are worse than both Masters and PhDs)
  
• All who study more than 21 years are ....dead :D:D

What do you think?