1981   298.57 298.63 298.53 298.61 298.53 298.71 298.68 298.50 298.71 298.55 298.53 298.61 298.66 298.56 298.57
1982   298.71 298.73 298.81 298.76 298.79 298.77 298.73 298.75 298.69 298.72 298.77 298.74 298.75 298.58 298.85
1983   298.71 298.77 298.74 298.85 298.69 298.77 298.73 298.77 298.78 298.72 298.74 298.83 298.78 298.75 298.68
1984   298.67 298.63 298.50 298.52 298.58 298.67 298.62 298.61 298.66 298.53 298.58 298.59 298.53 298.53 298.59
1985   298.49 298.52 298.56 298.49 298.40 298.47 298.47 298.46 298.47 298.40 298.50 298.57 298.57 298.57 298.56
1986   298.76 298.65 298.58 298.60 298.55 298.46 298.55 298.62 298.64 298.47 298.55 298.57 298.65 298.50 298.59
1987   298.69 298.86 298.66 298.83 298.75 298.79 298.85 298.78 298.81 298.91 298.85 298.85 298.73 298.75 298.75
1988   298.56 298.66 298.58 298.65 298.46 298.62 298.67 298.69 298.65 298.71 298.62 298.66 298.64 298.73 298.59
1989   298.52 298.52 298.50 298.51 298.54 298.68 298.48 298.63 298.59 298.68 298.61 298.63 298.55 298.63 298.59
1990   298.74 298.77 298.82 298.78 298.80 298.71 298.70 298.76 298.76 298.69 298.66 298.70 298.75 298.67 298.66
1991   298.91 298.78 298.76 298.74 298.68 298.75 298.74 298.72 298.75 298.67 298.79 298.83 298.91 298.76 298.84
1992   298.78 298.81 298.87 298.73 298.79 298.85 298.76 298.80 298.90 298.93 298.78 298.85 299.02 298.87 298.81
1993   298.76 298.71 298.71 298.67 298.78 298.77 298.85 298.80 298.79 298.62 298.86 298.76 298.82 298.82 298.81
1994   298.71 298.63 298.63 298.63 298.52 298.73 298.67 298.66 298.61 298.66 298.70 298.63 298.66 298.58 298.70
1995   298.58 298.55 298.61 298.53 298.42 298.66 298.54 298.63 298.58 298.51 298.61 298.57 298.60 298.60 298.66
1996   298.62 298.62 298.72 298.60 298.67 298.70 298.71 298.64 298.60 298.61 298.59 298.70 298.66 298.67 298.57
1997   298.84 298.80 298.80 298.81 298.69 298.74 298.92 298.86 298.89 298.82 298.78 298.83 298.87 298.80 298.83
1998   298.82 298.68 298.63 298.83 298.80 298.75 298.70 298.69 298.68 298.75 298.75 298.62 298.79 298.67 298.83
1999   298.45 298.40 298.55 298.51 298.49 298.40 298.42 298.57 298.45 298.43 298.43 298.42 298.53 298.46 298.46
2000   298.45 298.48 298.37 298.50 298.40 298.51 298.48 298.34 298.47 298.48 298.45 298.42 298.47 298.46 298.52
2001   298.64 298.64 298.57 298.73 298.65 298.63 298.75 298.75 298.74 298.71 298.77 298.82 298.77 298.73 298.79
2002   298.75 298.81 298.85 298.77 298.71 299.18 298.83 298.89 298.92 298.85 298.89 298.99 298.92 298.90 298.91
2003   298.70 298.60 298.70 298.60 298.63 298.67 298.81 298.73 298.83 298.62 298.74 298.77 298.70 298.85 298.55
2004   298.73 298.83 298.72 298.71 298.67 298.76 298.75 298.88 298.83 298.75 298.79 298.85 298.71 298.79 298.76
2005   298.73 298.73 298.60 298.75 298.69 298.75 298.79 298.76 298.75 298.82 298.79 298.91 298.76 298.76 298.84
2006   298.78 298.79 298.83 298.67 298.77 298.66 298.77 298.77 298.82 298.78 298.75 298.76 298.68 298.80 298.86
2007   298.62 298.52 298.57 298.55 298.68 298.48 298.54 298.56 298.64 298.51 298.65 298.59 298.60 298.55 298.53
2008   298.43 298.58 298.50 298.53 298.49 298.51 298.49 298.57 298.55 298.56 298.60 298.51 298.59 298.62 298.51
2009   298.65 298.69 298.71 298.72 298.69 298.73 298.70 298.72 298.72 298.69 298.63 298.69 298.69 298.75 298.73