1987 | 12.37 | −0.41 | 0.04 | ||
1988 | 12.53 | −2.50 | ● | −0.56 | ● |
1989 | 12.41 | −2.54 | ● | −0.97 | ● |
1990 | 11.98 | −3.14 | ● | −1.43 | ● |
1991 | 11.45 | −2.88 | ● | −2.05 | ● |
1992 | 10.58 | −0.37 | ● | −1.32 | ● |
1993 | 9.44 | −0.04 | ● | −0.61 | ● |
1994 | 9.29 | 0.09 | −0.79 | ||
1995 | 8.85 | 0.05 | ● | 0.15 | ● |
1996 | 8.52 | 0.99 | ● | 0.66 | ● |
1997 | 9.00 | −0.04 | 0.27 | ||
1998 | 9.17 | −0.26 | ● | −0.63 | ● |
1999 | 9.26 | −1.42 | ● | −0.88 | ● |
2000 | 8.55 | −0.08 | ● | −0.99 | ● |
2001 | 8.41 | −0.59 | ● | −1.01 | ● |
2002 | 7.58 | −0.50 | ● | −0.30 | ● |
2003 | 7.42 | −0.43 | ● | −0.64 | ● |
2004 | 7.29 | −0.54 | 0.03 | ||
2005 | 6.79 | 0.94 | ● | 0.60 | ● |
2006 | 7.32 | −0.02 | ● | −0.28 | ● |
2007 | 7.38 | 0.01 | ● | 0.23 | ● |
2008 | 7.04 | 0.85 | ● | 0.92 | ● |
2009 | 7.61 | −0.06 | 1.17 | ||
2010 | 7.94 | 1.37 | ● | 1.41 | ● |