Year	GMSL	SD
1930.5	-31.3	10.72
1931.5	-25.79	11.09
1932.5	-33.85	11.61
1933.5	-28.84	11.61
1934.5	-26.58	11.43
1935.5	-24.36	11.35
1936.5	-29.58	11.42
1937.5	-23.09	11.51
1938.5	-13.82	11.32
1939.5	-12.69	11.33
1940.5	-11.85	10.66
1941.5	-0.91	10.42
1942.5	-3.61	10.56
1943.5	-0.04	10.68
1944.5	-5.85	9.94
1945.5	2.83	9.76
1946.5	3.1	9.7
1947.5	10.59	8.86
1948.5	15.84	8.52
1949.5	23.77	7.59
1950.5	25.16	7.16
1951.5	33.16	6.91
1952.5	29.81	6.71
1953.5	30.77	6.54
1954.5	31.22	6.25
1955.5	34.57	6.02
1956.5	28.45	6
1957.5	42.64	6.02
1958.5	42.15	5.59
1959.5	46.62	5.36
1960.5	52.13	5.42
1961.5	55.43	5.39
1962.5	54.99	5.4
1963.5	51.56	5.42
1964.5	44.43	5.72
1965.5	49.2	5.7
1966.5	40.58	5.6
1967.5	42.95	5.5
1968.5	46.74	5.68
1969.5	48.41	5.94
1970.5	50.61	5.92
1971.5	56.38	5.86
1972.5	61.96	5.91
1973.5	62.76	5.78
1974.5	71.66	5.75
1975.5	70.48	5.68
1976.5	66.88	5.71
1977.5	65.49	5.49
1978.5	72.35	5.45
1979.5	70.5	5.51
1980.5	75.57	5.44
1981.5	82.6	5.39
1982.5	78.15	5.09
1983.5	84.48	5.19
1984.5	86.44	5.08
1985.5	82.96	4.96
1986.5	81.45	4.88
1987.5	85.02	4.88
1988.5	89.46	5.09
1989.5	94.46	5.16
1990.5	94.69	5.08
1991.5	97.45	4.98
1992.5	97.1	5.01
1993.5	92.79	4.91
1994.5	96.11	4.88
1995.5	100.95	4.93
1996.5	104.89	4.88
1997.5	110.35	4.96
1998.5	105.44	4.97
1999.5	113.55	5.09
2000.5	114.15	5.11
2001.5	115.24	5.07
2002.5	115.28	5.17
2003.5	121.73	5.38
2004.5	123.41	6.11
2005.5	128.05	6.43
2006.5	141.67	6.87
2007.5	137.64	7.22