4 ms·
2009 is latest reported year. For comparison: 1992 5.7 1993 6.2 1994 6.8 1995 5.3 1996 7.5 1997 7.0 1998 7.2 1999 7.2 2000
by ddeck 13y ago
2009 is latest reported year. For comparison:
1992 5.7
1993 6.2
1994 6.8
1995 5.3
1996 7.5
1997 7.0
1998 7.2
1999 7.2
2000 7.9
2001 10.6
2002 10.7
2003 10.8
2004 8.3
2005 7.5
2006 8.5
2007 10.1
2008 13.1
2009 16.0