| Year | Experience Modifier | Company Manhours | Recordable Incidents | Incident Rate |
| 1993 | 1.00 | 15,500 | 0 | 0.00 |
| 1994 | 1.00 | 40,260 | 0 | 0.00 |
| 1995 | 1.00 | 44,704 | 0 | 0.00 |
| 1996 | 0.93 | 73,370 | 1 | 2.73 |
| 1997 | 0.83 | 75,600 | 0 | 0.00 |
| 1998 | 0.73 | 97,128 | 1 | 2.06 |
| 1999 | 0.83 | 50,395 | 0 | 0.00 |
| 2000 | 0.82 | 104,601 | 2 | 3.82 |
| 2001 | 0.82 | 156,997 | 0 | 0.00 |
| 2002 | 0.83 | 113,724 | 2 | 3.52 |
| 2003 | 0.68 | 125,324 | 0 | 0.00 |
| 2004 | 0.73 | 59,233 | 2 | 6.75 |
| 2005 | 0.76 | 106,383 | 0 | 0.00 |
| 2006 | 0.88 | 129,840 | 0 | 0.00 |
| 2007 | 0.85 | 195,548 | 0 | 0.00 |
| 2008 | 0.83 | 211,833 | 1 | 0.94 |
| 2009 | 0.73 | 179,836 | 1 | 1.11 |
| Averages | 0.84 | 111,267 | 0.6 | 1.12 |