P · 9 seasons · 1975 – 1988 · B/T: R/R
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1975 | PIT | 2 | -2.32 | #470 | #89,491 |
| 1977 | PIT | 34 | -2.62 | #826 | #103,068 |
| 1978 | PIT | 3 | -2.31 | #711 | #88,591 |
| 1979 | SEA | 25 | -2.29 | #466 | #87,086 |
| 1981 | PIT | 13 | -2.35 | #770 | #91,840 |
| 1983 | TEX | 42 | -2.26 | #494 | #83,792 |
| 1984 | TEX | 33 | -2.28 | #520 | #85,717 |
| 1986 | BAL | 21 | -2.31 | #503 | #89,036 |
| 1988★ | ML4 | 28 | -2.22 | #479 | #78,807 |
★ Best season by Z
| Season ↑ | Tm | G | Z | Szn | All-Time |
|---|---|---|---|---|---|
| 1975 | PIT | 2 | -2.27 | #229 | #35,584 |
| 1977 | PIT | 34 | -1.88 | #207 | #30,034 |
| 1978 | PIT | 3 | -1.80 | #203 | #29,174 |
| 1979 | SEA | 25 | -5.19 | #386 | #50,922 |
| 1981 | PIT | 13 | -0.60 | #156 | #21,197 |
| 1983★ | TEX | 42 | 1.93 | #93 | #11,756 |
| 1984 | TEX | 33 | -1.51 | #210 | #26,697 |
| 1986 | BAL | 21 | -2.12 | #252 | #33,339 |
| 1988 | ML4 | 28 | -0.72 | #182 | #21,787 |
★ Best season by Z