1852.50     0.0000
1857.50     0.0000
1862.50     0.0000
1867.50     0.0000
1872.50     0.0000
1877.50     0.0000
1882.50     0.0000
1887.50     0.0000
1892.50     0.0000
1897.50     0.0000
1902.50     0.0000
1907.50     0.0000
1912.50     0.0000
1917.50     0.0000
1922.50     0.0000
1927.50     0.0000
1932.50     0.0000
1937.50     0.0000
1942.50     0.0000
1947.50     0.0000
1952.50     0.0000
1957.50  -343.0000
1962.50  -183.0000
1967.50  -261.0000
1972.50  -207.0000
1977.50  -411.0000
1982.50  -359.0000
1987.50  -338.0000
1992.50  -334.0000
1997.50  -522.0000
2002.50  -751.0000
2007.50  -518.0000

Glacier mass balance: 

Cogley (2009) inerpolated (dark grey). 

Cogley J.G. (2009): Geodetic and direct mass-balance 
measurements: comparison and joint analysis. Annals 
of Glaciology 50(50) 96-100.

Values are five year averages.

Data obtained from Graham Cogley