Table 6
Noise Barrier Construction
Average Unit Cost by Year
| Year | Area in Square Feet (100,00) |
2007 Cost ($Millions) |
Cost Per Square Foot (Dollars) |
|---|---|---|---|
| 1963-1986 | 312 | 612 | 20 |
| 1987 | 36 | 78 | 22 |
| 1988 | 70 | 184 | 26 |
| 1989 | 74 | 179 | 24 |
| 1990 | 52 | 118 | 23 |
| 1991 | 80 | 193 | 24 |
| 1992 | 104 | 249 | 24 |
| 1993 | 64 | 158 | 25 |
| 1994 | 66 | 152 | 23 |
| 1995 | 95 | 222 | 23 |
| 1996 | 42 | 87 | 21 |
| 1997 | 83 | 197 | 24 |
| 1998 | 118 | 265 | 23 |
| 1999 | 42 | 121 | 29 |
| 2000 | 65 | 161 | 25 |
| 2001 | 96 | 234 | 24 |
| 2002 | 67 | 210 | 32 |
| 2003 | 80 | 204 | 26 |
| 2004 | 87 | 177 | 20 |
| 2005 | 71 | 196 | 28 |
| 2006 | 87 | 237 | 27 |
| 2007 | 75 | 241 | 32 |
| UnknownYear | 5 | 0 | 0 |
| All | 1,864 | 4,474 | 24 |
