1981 298.63 298.65 298.66 298.68 298.71 298.72 298.67 298.71 298.77 298.73 298.67 298.67 298.66 298.65 298.70 1982 298.87 298.78 298.88 298.87 298.84 298.78 298.80 298.78 298.78 298.88 298.79 298.81 298.80 298.78 298.84 1983 298.73 298.77 298.75 298.80 298.82 298.80 298.81 298.86 298.81 298.84 298.83 298.83 298.84 298.85 298.86 1984 298.54 298.55 298.63 298.58 298.63 298.60 298.64 298.65 298.65 298.63 298.62 298.58 298.58 298.58 298.59 1985 298.60 298.57 298.62 298.66 298.65 298.63 298.65 298.63 298.65 298.62 298.64 298.64 298.66 298.69 298.67 1986 298.64 298.76 298.68 298.72 298.74 298.71 298.79 298.82 298.78 298.78 298.72 298.75 298.69 298.75 298.80 1987 298.82 298.99 298.95 298.94 298.94 298.92 298.91 298.97 299.00 298.98 298.99 299.00 299.02 299.04 298.98 1988 298.72 298.70 298.75 298.75 298.76 298.64 298.73 298.73 298.69 298.70 298.71 298.77 298.80 298.72 298.73 1989 298.71 298.73 298.71 298.77 298.76 298.67 298.67 298.71 298.72 298.75 298.71 298.66 298.73 298.75 298.71 1990 298.75 298.74 298.74 298.70 298.85 298.76 298.82 298.87 298.88 298.85 298.87 298.86 298.84 298.89 298.89 1991 298.96 298.93 298.96 299.01 299.00 298.97 298.90 299.00 298.97 298.92 298.94 298.95 298.94 298.95 298.96 1992 298.78 298.81 298.79 298.87 298.84 298.79 298.86 298.78 298.82 298.85 298.75 298.75 298.76 298.82 298.77 1993 298.79 298.84 298.77 298.86 298.87 298.83 298.79 298.83 298.83 298.86 298.86 298.83 298.78 298.77 298.81 1994 298.57 298.65 298.60 298.70 298.71 298.63 298.63 298.66 298.66 298.69 298.68 298.65 298.62 298.64 298.66 1995 298.76 298.83 298.81 298.77 298.82 298.83 298.83 298.90 298.88 298.85 298.80 298.85 298.88 298.81 298.86 1996 298.65 298.63 298.61 298.70 298.67 298.61 298.62 298.63 298.65 298.69 298.67 298.64 298.74 298.75 298.70 1997 299.09 299.10 299.07 299.14 299.10 299.04 299.02 299.06 299.02 299.11 299.01 299.03 299.01 299.01 299.05 1998 298.82 298.84 298.83 298.88 298.90 298.80 298.80 298.81 298.82 298.81 298.87 298.86 298.86 298.90 298.91 1999 298.53 298.56 298.61 298.65 298.60 298.61 298.55 298.65 298.64 298.64 298.65 298.63 298.68 298.63 298.62 2000 298.51 298.55 298.61 298.63 298.63 298.66 298.69 298.64 298.63 298.69 298.67 298.71 298.75 298.73 298.76 2001 298.83 298.86 298.81 298.83 298.87 298.73 298.84 298.90 298.94 298.82 298.83 298.86 298.82 298.90 298.90 2002 298.99 298.84 298.86 298.82 298.86 299.02 298.98 299.01 299.02 299.03 299.01 299.02 299.09 298.97 299.08 2003 298.85 298.80 298.83 298.93 298.81 298.91 298.89 298.96 298.93 298.91 298.97 299.01 298.95 298.95 298.94 2004 298.88 298.87 298.84 298.84 298.82 298.87 298.82 298.86 298.88 298.78 298.82 298.90 298.89 298.87 298.91 2005 298.91 298.94 298.88 298.93 298.91 298.89 298.89 298.93 298.97 298.91 298.86 298.93 298.97 298.89 298.91 2006 298.79 298.86 298.87 298.88 298.84 298.89 298.87 298.95 298.92 298.95 298.93 298.92 298.92 298.95 298.91 2007 298.68 298.67 298.80 298.73 298.68 298.77 298.80 298.77 298.66 298.72 298.77 298.78 298.77 298.74 298.76 2008 298.81 298.78 298.76 298.79 298.82 298.83 298.84 298.80 298.86 298.86 298.83 298.80 298.80 298.83 298.81 2009 299.12 299.08 299.12 299.04 298.96 299.13 299.10 299.08 299.06 299.09 299.16 299.13 299.12 299.11 299.10