1981   298.54 298.56 298.60 298.67 298.59 298.62 298.55 298.64 298.58 298.64 298.57 298.63 298.59 298.60 298.63
1982   298.68 298.70 298.76 298.77 298.73 298.75 298.83 298.78 298.81 298.69 298.81 298.77 298.81 298.81 298.81
1983   298.79 298.76 298.88 298.84 298.70 298.78 298.77 298.77 298.84 298.80 298.84 298.85 298.78 298.85 298.75
1984   298.57 298.51 298.49 298.56 298.49 298.48 298.57 298.44 298.49 298.50 298.50 298.54 298.49 298.49 298.47
1985   298.49 298.53 298.64 298.52 298.49 298.56 298.49 298.53 298.50 298.48 298.53 298.48 298.53 298.56 298.55
1986   298.61 298.58 298.66 298.55 298.58 298.63 298.63 298.67 298.65 298.68 298.55 298.59 298.69 298.52 298.66
1987   298.76 298.79 298.81 298.87 298.91 299.04 298.93 298.92 298.89 298.87 298.94 299.05 298.97 298.92 299.04
1988   298.61 298.64 298.64 298.71 298.74 298.58 298.67 298.61 298.68 298.60 298.59 298.67 298.66 298.75 298.68
1989   298.54 298.59 298.60 298.59 298.59 298.62 298.66 298.62 298.54 298.53 298.53 298.56 298.67 298.59 298.57
1990   298.64 298.68 298.61 298.70 298.66 298.65 298.64 298.68 298.65 298.72 298.66 298.68 298.64 298.66 298.64
1991   298.88 298.93 298.96 298.83 298.81 298.89 298.93 298.88 298.87 298.87 298.87 298.79 298.83 298.86 298.90
1992   298.76 298.74 298.72 298.68 298.76 298.74 298.71 298.75 298.74 298.69 298.71 298.75 298.69 298.70 298.74
1993   298.83 298.75 298.74 298.81 298.76 298.81 298.79 298.81 298.74 298.84 298.74 298.75 298.73 298.74 298.73
1994   298.63 298.55 298.66 298.60 298.59 298.65 298.71 298.72 298.62 298.63 298.64 298.69 298.67 298.69 298.64
1995   298.63 298.67 298.69 298.68 298.67 298.66 298.58 298.66 298.66 298.68 298.59 298.59 298.65 298.69 298.66
1996   298.57 298.54 298.53 298.51 298.62 298.54 298.60 298.56 298.56 298.62 298.56 298.67 298.66 298.61 298.57
1997   298.91 298.88 298.88 298.86 298.90 298.99 298.92 298.95 298.94 298.86 299.00 298.97 299.02 299.03 298.95
1998   298.77 298.78 298.82 298.70 298.82 298.73 298.73 298.70 298.77 298.79 298.77 298.78 298.85 298.70 298.82
1999   298.48 298.47 298.57 298.48 298.46 298.41 298.41 298.44 298.47 298.45 298.44 298.47 298.56 298.52 298.55
2000   298.54 298.46 298.50 298.42 298.56 298.46 298.54 298.48 298.43 298.55 298.50 298.50 298.40 298.51 298.52
2001   298.79 298.65 298.67 298.69 298.64 298.65 298.67 298.64 298.72 298.67 298.65 298.62 298.67 298.73 298.71
2002   298.58 298.65 298.76 298.69 298.80 298.84 298.84 298.85 298.94 298.73 298.91 298.83 298.66 298.74 298.96
2003   298.62 298.59 298.58 298.55 298.55 298.77 298.81 298.69 298.81 298.68 298.66 298.76 298.79 298.73 298.79
2004   298.73 298.77 298.57 298.72 298.67 298.78 298.61 298.72 298.70 298.67 298.78 298.66 298.69 298.65 298.74
2005   298.77 298.78 298.74 298.85 298.79 298.75 298.75 298.83 298.76 298.79 298.75 298.71 298.70 298.73 298.71
2006   298.86 298.79 298.78 298.84 298.79 298.76 298.72 298.75 298.77 298.81 298.73 298.74 298.77 298.75 298.82
2007   298.68 298.58 298.62 298.64 298.62 298.56 298.48 298.64 298.62 298.62 298.55 298.50 298.65 298.57 298.57
2008   298.68 298.62 298.66 298.66 298.64 298.76 298.63 298.65 298.67 298.67 298.72 298.62 298.65 298.74 298.67
2009   298.80 298.87 298.90 298.85 298.72 298.90 298.94 298.88 298.90 298.92 298.99 298.95 298.88 298.91 298.91