I have the following stem and leaf display:

4 | 5 8

5 |

6 | 4

7 | 0 3 4 4 8 8 9 9

8 | 0 0 0 0 0 0 1 2 2

What is the unusual feature of this display and what might explain this? It is based off of the number of games Wayne Gretzky played each season throughout his career.