Forget which DIS'r originally came up with this chart, but it's a good one to bookmark.
Year OKW BWV VB VB(sub) HH VWL BCV SSR
2006 4.24 4.69 5.27 4.12 4.34 4.61 4.48 3.98
2005 3.86 4.41 4.87 3.84 3.86 4.35 4.27 3.83
2004 3.68 4.25 4.67 3.67 3.70 4.22 4.18 3.80
2003 3.49 4.11 4.37 4.37 3.69 4.05 3.97
2002 3.22 3.92 4.17 3.33 3.49 3.80 3.77
2001 3.13 3.83 3.98 2.70 3.32 3.63
2000 3.16 3.94 4.07 2.87 3.25 3.62
1999 3.16 4.02 3.99 2.82 3.18
1998 3.17 3.94 ---- 2.76 3.20
1997 3.14 3.84 ---- 2.90 3.16
1996 2.99 3.70 ---- 2.82 3.16
1995 2.84
1994 2.70
1993 2.63
1992 2.56
1991 2.51
Best wishes -
_