|
| 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 |
| Male | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 |
|
| (3.9 - 5.4) | (4.0 - 5.3) | (4.0 - 5.3) | (4.1 - 5.2) | (4.1 - 5.2) | (4.2 - 5.1) | (4.3 - 5.1) | (4.3 - 5.1) | (4.3 - 5.0) | (4.4 - 5.0) |
| Female | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 |
|
| (3.8 - 5.6) | (3.9 - 5.5) | (3.9 - 5.4) | (4.0 - 5.3) | (4.1 - 5.3) | (4.2 - 5.2) | (4.2 - 5.2) | (4.3 - 5.1) | (4.3 - 5.1) | (4.4 - 5.1) |
|
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 |
| Male | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 |
|
| (4.4 - 5.0) | (4.5 - 5.0) | (4.5 - 5.0) | (4.5 - 5.0) | (4.5 - 5.1) | (4.6 - 5.1) | (4.6 - 5.1) | (4.6 - 5.1) | (4.6 - 5.1) | (4.6 - 5.1) |
| Female | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 4.9 | 4.9 |
|
| (4.4 - 5.1) | (4.4 - 5.1) | (4.5 - 5.1) | (4.5 - 5.1) | (4.5 - 5.2) | (4.5 - 5.2) | (4.6 - 5.2) | (4.6 - 5.2) | (4.6 - 5.3) | (4.6 - 5.3) |
|
| 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 |
| Male | 4.4 | 4.3 | 5 | 5 | 5 | 5 | 5.1 | 5.1 | 5.1 | 5.2 |
|
| (3.8 - 4.9) | (3.8 - 4.9) | (4.7 - 5.2) | (4.8 - 5.2) | (4.8 - 5.2) | (4.8 - 5.3) | (4.8 - 5.3) | (4.9 - 5.3) | (4.9 - 5.4) | (4.5 - 5.4) |
| Female | 4.9 | 4.9 | 5 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.3 |
|
| (4.7 - 5.2) | (4.7 - 5.2) | (4.7 - 5.3) | (4.8 - 5.3) | (4.8 - 5.4) | (4.9 - 5.4) | (4.9 - 5.4) | (4.9 - 5.5) | (4.9 - 5.5) | (4.9 - 5.6) |