|
1000 Trip-Hours |
Pounds /Trip-Hour |
| 2007 |
0.726 |
36.10 |
| 2006 |
0.893 |
33.86 |
| 2005 |
0.899 |
25.61 |
| 2004 |
1.199 |
25.30 |
| 2003 |
1.044 |
31.78 |
| 2002 |
1.378 |
19.58 |
| 2001 |
1.661 |
17.72 |
| 2000 |
1.123 |
22.01 |
| 1999 |
1.971 |
26.81 |
| 1998 |
1.405 |
19.93 |
| 1997 |
3.159 |
22.31 |
| 1996 |
4.422 |
27.36 |
| 1995 |
12.114 |
22.93 |
| 1994 |
11.450 |
21.23 |
| 1993 |
3.169 |
20.08 |
| 1992 |
4.093 |
28.99 |
| 1991 |
4.482 |
20.96 |
| 1990 |
4.335 |
21.98 |
| 1989 |
8.425 |
23.87 |
| 1988 |
6.126 |
38.01 |
| 1987 |
6.182 |
25.34 |
| 1986 |
11.358 |
19.35 |
| 1985 |
4.394 |
32.59 |
| 1984 |
7.785 |
30.97 |
| 1983 |
3.513 |
27.41 |
| 1982 |
1.019 |
25.91 |
| AVERAGE |
4.166 |
25.69 |
| STD. DEV. |
3.437 |
5.39 |
|
