How to read this chart:

From 1988 through 2010 (both inclusive) I input each team's salary and whether or not they made the playoffs. I then normalized each team's salary to the league average.

I set the independent variable as the normalized team salary. The independent variable (blue) is the % of teams that make the playoffs who have normalized salaries between (right side is inclusive):
0 and 0.25
0.25 and 0.50
0.50 and 0.75
0.75 and 1.00
1.00 and 1.25
1.25 and 1.50
1.50 and 1.75
1.75 and 2.00
2.00 and 2.25
2.25 and 2.50
2.50 and 2.75
2.75 and infinity

I then divided the number of playoff appearances in each range by the total number of teams that occurred in each respective range.