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observations": 7.0, "Year": 1956},{"Mean cumulative mass balance": -6.989, "Number of observations": 9.0, "Year": 1957},{"Mean cumulative mass balance": -7.693, "Number of observations": 9.0, "Year": 1958},{"Mean cumulative mass balance": -8.325, "Number of observations": 11.0, "Year": 1959},{"Mean cumulative mass balance": -8.688, "Number of observations": 14.0, "Year": 1960},{"Mean cumulative mass balance": -8.935, "Number of observations": 15.0, "Year": 1961},{"Mean cumulative mass balance": -9.109, "Number of observations": 20.0, "Year": 1962},{"Mean cumulative mass balance": -9.567, "Number of observations": 22.0, "Year": 1963},{"Mean cumulative mass balance": -9.699, "Number of observations": 22.0, "Year": 1964},{"Mean cumulative mass balance": -9.298, "Number of observations": 24.0, "Year": 1965},{"Mean cumulative mass balance": -9.436, "Number of observations": 27.0, "Year": 1966},{"Mean cumulative mass balance": -9.303, "Number of observations": 29.0, "Year": 1967},{"Mean cumulative mass balance": -9.219, "Number of observations": 31.0, "Year": 1968},{"Mean cumulative mass balance": -9.732, "Number of observations": 31.0, "Year": 1969},{"Mean cumulative mass balance": -10.128, "Number of observations": 32.0, "Year": 1970},{"Mean cumulative mass balance": -10.288, "Number of observations": 32.0, "Year": 1971},{"Mean cumulative mass balance": -10.441, "Number of observations": 32.0, "Year": 1972},{"Mean cumulative mass balance": -10.538, "Number of observations": 32.0, "Year": 1973},{"Mean cumulative mass balance": -10.613, "Number of observations": 32.0, "Year": 1974},{"Mean cumulative mass balance": -10.534, "Number of observations": 33.0, "Year": 1975},{"Mean cumulative mass balance": -10.633, "Number of observations": 35.0, "Year": 1976},{"Mean cumulative mass balance": -10.682, "Number of observations": 37.0, "Year": 1977},{"Mean cumulative mass balance": -10.754, "Number of observations": 37.0, "Year": 1978},{"Mean cumulative mass balance": -11.127, "Number of observations": 37.0, "Year": 1979},{"Mean cumulative mass balance": -11.318, "Number of observations": 36.0, "Year": 1980},{"Mean cumulative mass balance": -11.394, "Number of observations": 35.0, "Year": 1981},{"Mean cumulative mass balance": -11.849, "Number of observations": 36.0, "Year": 1982},{"Mean cumulative mass balance": -11.846, "Number of observations": 37.0, "Year": 1983},{"Mean cumulative mass balance": -11.902, "Number of observations": 37.0, "Year": 1984},{"Mean cumulative mass balance": -12.238, "Number of observations": 37.0, "Year": 1985},{"Mean cumulative mass balance": -12.782, "Number of observations": 37.0, "Year": 1986},{"Mean cumulative mass balance": -12.795, "Number of observations": 37.0, "Year": 1987},{"Mean cumulative mass balance": -13.26, "Number of observations": 37.0, "Year": 1988},{"Mean cumulative mass balance": -13.343, "Number of observations": 37.0, "Year": 1989},{"Mean cumulative mass balance": -13.687, "Number of observations": 37.0, "Year": 1990},{"Mean cumulative mass balance": -14.255, "Number of observations": 37.0, "Year": 1991},{"Mean cumulative mass balance": -14.501, "Number of observations": 36.0, "Year": 1992},{"Mean cumulative mass balance": -14.695, "Number of observations": 37.0, "Year": 1993},{"Mean cumulative mass balance": -15.276, "Number of observations": 37.0, "Year": 1994},{"Mean cumulative mass balance": -15.486, "Number of observations": 37.0, "Year": 1995},{"Mean cumulative mass balance": -15.89, "Number of observations": 37.0, "Year": 1996},{"Mean cumulative mass balance": -16.487, "Number of observations": 37.0, "Year": 1997},{"Mean cumulative mass balance": -17.31, "Number of observations": 37.0, "Year": 1998},{"Mean cumulative mass balance": -17.697, "Number of observations": 37.0, "Year": 1999},{"Mean cumulative mass balance": -17.727, "Number of observations": 37.0, "Year": 2000},{"Mean cumulative mass balance": -18.032, "Number of observations": 37.0, "Year": 2001},{"Mean cumulative mass balance": -18.726, "Number of observations": 37.0, "Year": 2002},{"Mean cumulative mass balance": -19.984, "Number of observations": 37.0, "Year": 2003},{"Mean cumulative mass balance": -20.703, "Number of observations": 37.0, "Year": 2004},{"Mean cumulative mass balance": -21.405, "Number of observations": 37.0, "Year": 2005},{"Mean cumulative mass balance": -22.595, "Number of observations": 37.0, "Year": 2006},{"Mean cumulative mass balance": -23.255, "Number of observations": 37.0, "Year": 2007},{"Mean cumulative mass balance": -23.776, "Number of observations": 37.0, "Year": 2008},{"Mean cumulative mass balance": -24.459, "Number of observations": 37.0, "Year": 2009},{"Mean cumulative mass balance": -25.158, "Number of observations": 37.0, "Year": 2010},{"Mean cumulative mass balance": -26.294, "Number of observations": 37.0, "Year": 2011},{"Mean cumulative mass balance": -26.93, "Number of observations": 36.0, "Year": 2012},{"Mean cumulative mass balance": -27.817, "Number of observations": 31.0, "Year": 2013},{"Mean cumulative mass balance": -28.652, "Number of observations": 24.0, "Year": 2014}]