Raw values of MVPI and DAI on a monthly and summer (JJA) mean basis Year MVPI6 MVPI7 MVPI8 MVPI678 DAI6 DAI7 DAI8 DAI678 1951 -0.56 0.62 -0.44 -0.27 -5.57 7.83 -3.31 0.6 1952 0.04 0.62 0.32 0.28 -2.33 11.81 4.34 4.27 1953 1.48 -0.78 -0.6 -0.07 -0.52 -1.85 -4.98 -1.59 1954 2.8 3.18 -0.21 1.79 15.37 17.73 -1.01 13.03 1955 0.25 0.47 -0.28 0.19 -0.22 5.61 8.27 3.96 1956 1.44 -1.09 0.14 0.13 2.5 -7.58 8.59 1.16 1957 -0.08 1.04 -0.13 0.34 5.17 -1.18 1.5 -0.63 1958 -0.71 -0.48 0.61 -0.12 -3.77 -1.68 7.75 -2.06 1959 0.71 -0.53 -0.22 -0.13 7.03 -5.68 -2.13 -0.87 1960 -1.04 -0.58 -0.9 -0.89 -7.99 -2.33 -18.16 -8.02 1961 -0.28 -0.73 0.04 -0.36 3.41 -3.92 -1.76 -3.2 1962 0.34 -0.39 0.28 0.17 1.06 2.35 6.99 2.58 1963 -1.56 -0.03 0.59 -0.18 -14.11 -2.83 17.56 -1.33 1964 0.58 -0.25 -0.18 -0.03 1.03 -3.47 -6.08 -1.18 1965 -1.07 0.37 0.42 0.12 -9.41 -4.67 6.25 -3.06 1966 -0.16 -0.56 -0.47 -0.5 -3.06 -4.93 5.5 -1.13 1967 -0.54 -0.37 -0.26 -0.62 -2.86 -0.62 -15.63 -8.72 1968 -1.0 0.55 0.48 -0.0 -8.14 11.21 -6.2 -0.64 1969 -0.29 0.2 0.42 0.28 -10.59 -2.2 6.73 -2.82 1970 0.25 0.98 0.02 0.34 -4.13 4.72 -11.82 -0.14 1971 0.87 -1.01 0.64 0.23 -0.99 -10.76 18.75 -1.9 1972 -0.36 -1.17 -0.16 -0.56 -2.32 -8.87 -2.33 -2.79 1973 -0.23 -0.99 -0.54 -0.84 3.72 -2.09 -18.26 -9.79 1974 -0.71 1.04 -0.25 0.09 -10.9 9.08 -6.07 3.09 1975 0.08 0.36 -0.71 -0.13 -0.69 6.05 -10.46 3.92 1976 -0.09 -0.5 0.57 -0.03 0.09 1.01 -2.71 -1.49 1977 0.28 -0.39 -0.02 0.05 1.42 -5.62 27.65 3.05 1978 -0.9 -1.46 -0.69 -1.21 -6.36 -7.3 -20.52 -14.63 1979 -0.21 0.52 -0.32 -0.12 -11.21 8.83 -11.76 -0.93 1980 0.45 1.03 1.05 0.97 -6.53 -0.36 29.93 -0.55 1981 -1.38 -0.5 0.09 -0.51 -10.64 -4.26 -2.54 -6.47 1982 -0.73 0.0 0.31 0.05 -6.25 7.83 13.46 6.06 1983 0.13 1.18 -0.29 0.25 12.66 1.29 -5.03 4.48 1984 -0.69 0.91 -0.81 -0.39 -0.28 8.99 -13.41 -1.48 1985 -1.62 -0.24 -0.7 -0.84 -18.63 -1.26 -7.12 -6.34 1986 0.51 0.04 -0.26 -0.04 0.87 -4.45 -42.06 -8.03 1987 -0.34 0.7 0.69 0.39 7.84 -0.63 1.51 -0.28 1988 0.02 -0.25 0.6 0.33 -1.57 1.3 22.11 4.15 1989 0.69 -0.52 0.01 0.14 0.49 0.85 12.01 7.36 1990 -0.92 -0.9 -0.79 -0.81 -7.47 -7.06 -20.99 -7.99 1991 0.48 0.39 0.42 0.49 -5.74 -4.74 27.08 -1.92 1992 -0.02 -0.32 -0.45 -0.23 -1.91 -8.09 -10.91 -4.14 1993 0.65 1.19 1.0 1.04 -2.95 10.77 2.48 4.33 1994 -0.24 -1.83 -0.38 -0.78 -2.87 -18.85 -3.0 -7.73 1995 0.59 -0.57 0.57 0.19 4.89 -6.81 -0.31 -2.06 1996 1.67 0.23 0.13 0.69 -3.79 -0.04 8.22 4.67 1997 -0.58 0.57 -0.46 -0.12 -8.67 1.74 -6.43 -3.83 1998 1.17 1.44 0.65 1.05 1.39 8.6 4.96 3.87 1999 0.23 0.58 0.6 0.71 7.2 17.65 24.9 15.71 2000 0.88 -1.03 -0.1 0.02 5.91 -5.85 4.82 3.0 2001 -0.39 -0.88 -0.05 -0.44 -1.5 -12.64 -10.77 -7.52 2002 0.31 -0.41 0.39 0.05 0.05 -6.82 -9.7 -3.77 2003 0.15 0.76 0.29 0.37 2.58 3.03 -3.68 0.47 2004 -0.84 -0.61 -0.32 -0.6 -0.75 -3.11 -12.53 -6.19 2005 -0.93 -0.15 0.16 -0.29 -7.54 -2.8 3.21 -4.12 2006 -0.38 0.09 -0.38 -0.39 -4.55 -1.72 -16.81 -3.76 2007 0.27 0.91 -0.23 0.3 9.62 8.45 -2.13 4.25 2008 0.29 -0.0 0.66 0.39 7.56 0.66 18.3 6.21 2009 -0.67 0.26 -0.42 -0.25 -9.88 -4.12 -12.65 -4.83 2010 0.1 0.69 -0.29 0.01 7.86 4.17 -4.46 2.11 2011 0.54 -0.22 0.12 0.25 -2.89 -2.62 8.73 0.08 2012 -1.26 -0.17 -0.55 -0.63 -3.27 -5.23 -12.84 -4.89 2013 -0.57 -0.11 -0.35 -0.45 4.66 -6.66 -8.84 -5.69 2014 0.01 -0.14 0.66 0.38 -6.12 -4.45 34.58 1.95 2015 1.46 -0.61 -0.32 0.15 3.39 -1.23 2.08 4.64 2016 0.44 0.38 -0.05 0.12 0.65 1.26 -30.58 2.03 2017 0.42 -0.91 0.69 0.29 4.02 -7.61 14.71 0.23 2018 -0.99 -1.25 -0.44 -0.84 -6.5 -9.75 -3.91 -6.72 2019 0.28 -0.05 -0.35 -0.15 0.35 4.8 -11.22 1.53 2020 1.93 2.36 0.16 1.32 6.97 11.85 -2.56 4.61 2021 -0.51 -0.66 0.14 -0.22 1.52 4.27 9.88 5.37 2022 -0.05 0.22 0.39 0.02 -2.09 5.15 -5.0 -1.93 2023 0.12 -0.27 0.06 0.06 -5.26 -2.38 3.0 -0.4 2024 0.51 -0.2 -0.27 0.08 -0.43 -4.01 9.36 -0.38 2025 -0.03 -2.09 0.26 -0.65 -2.63 -21.94 -3.64 -7.92