| December year | Males | Females |
| 1980 | 24 | 21.7 |
| 1981 | 24.2 | 21.9 |
| 1982 | 24.5 | 22.2 |
| 1983 | 24.8 | 22.6 |
| 1984 | 25 | 22.8 |
| 1985 | 25.3 | 23.1 |
| 1986 | 25.5 | 23.4 |
| 1987 | 25.9 | 23.7 |
| 1988 | 26.2 | 24 |
| 1989 | 26.4 | 24.2 |
| 1990 | 26.8 | 24.5 |
| 1991 | 26.9 | 24.6 |
| 1992 | 27 | 24.9 |
| 1993 | 27.3 | 25.2 |
| 1994 | 27.5 | 25.5 |
| 1995 | 27.8 | 25.8 |
| 1996 | 28.1 | 26.1 |
| 1997 | 28.3 | 26.5 |
| 1998 | 28.6 | 26.7 |
| 1999 | 28.9 | 27 |
| 2000 | 29.2 | 27.4 |
| 2001 | 29.3 | 27.5 |
| 2002 | 29.4 | 27.6 |
| 2003 | 29.5 | 27.7 |
| 2004 | 29.9 | 28.1 |
| 2005 | 30.1 | 28.2 |
| 2006 | 30 | 28.3 |
| 2007 | 30 | 28.2 |
| 2008 | 30 | 28.2 |
| 2009 | 29.8 | 28.2 |
| 2010 | 29.9 | 28.2 |
| 2011 | 29.9 | 28.4 |
| 2012 | 30 | 28.5 |
| 2013 | 30.1 | 28.6 |
| 2014 | 30.2 | 28.7 |
| 2015 | 30.2 | 28.8 |
| 2016 | 30.3 | 29 |
| 2017 | 30.2 | 29 |
| 2018 | 30.4 | 29.2 |
| December year | Age (years) |
| 1980 | 25.7 |
| 1981 | 25.8 |
| 1982 | 26 |
| 1983 | 26.2 |
| 1984 | 26.4 |
| 1985 | 26.6 |
| 1986 | 26.8 |
| 1987 | 27 |
| 1988 | 27.3 |
| 1989 | 27.4 |
| 1990 | 27.7 |
| 1991 | 27.9 |
| 1992 | 28.2 |
| 1993 | 28.3 |
| 1994 | 28.5 |
| 1995 | 28.6 |
| 1996 | 28.8 |
| 1997 | 29.1 |
| 1998 | 29.3 |
| 1999 | 29.5 |
| 2000 | 29.7 |
| 2001 | 29.8 |
| 2002 | 30.1 |
| 2003 | 30.2 |
| 2004 | 30.3 |
| 2005 | 30.4 |
| 2006 | 30.3 |
| 2007 | 30.1 |
| 2008 | 30 |
| 2009 | 29.9 |
| 2010 | 29.9 |
| 2011 | 30 |
| 2012 | 30 |
| 2013 | 30 |
| 2014 | 30.2 |
| 2015 | 30.2 |
| 2016 | 30.3 |
| 2017 | 30.3 |
| 2018 | 30.5 |
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