| Year |
COLA |
| 1975 |
8.0% |
| 1976 |
6.4% |
| 1977 |
5.9% |
| 1978 |
6.5% |
| 1979 |
9.9% |
| 1980 |
14.3% |
| 1981 |
11.2% |
| 1982 |
7.4% |
| 1983 |
3.5% |
| 1984 |
3.5% |
| 1985 |
3.1% |
| 1986 |
1.3% |
| 1987 |
4.2% |
| 1988 |
4.0% |
| 1989 |
4.7% |
|
| Year |
COLA |
| 1990 |
5.4% |
| 1991 |
3.7% |
| 1992 |
3.0% |
| 1993 |
2.6% |
| 1994 |
2.8% |
| 1995 |
2.6% |
| 1996 |
2.9% |
| 1997 |
2.1% |
| 1998 |
1.3% |
| 1999 |
a 2.5% |
| 2000 |
3.5% |
| 2001 |
2.6% |
| 2002 |
1.4% |
| 2003 |
2.1% |
| 2004 |
2.7% |
|
| Year |
COLA |
| 2005 |
4.1% |
| 2006 |
3.3% |
| 2007 |
2.3% |
|