Sample Interval is 01/01 12/31
 Acceptable missing, in percent =  10.0
 Year          Avg
 1949.00    54.93973
 1950.00    55.61983
 1951.00    51.99174
 1952.00    56.48907
 1953.00    56.03039
 1954.00    57.19373
 1955.00    55.76712
 1956.00    55.10765
 1957.00    55.72329
 1958.00    56.82967
 1959.00    54.71781
 1960.00    53.45628
 1961.00    53.26997
 1962.00    54.73151
 1963.00    54.34246
 1964.00    53.86339
 1965.00    53.78630
 1966.00    54.77348
 1967.00    54.33973
 1968.00    54.03288
 1969.00    56.29863
 1970.00    55.15342
 1971.00    54.15659
 1972.00    55.42076
 1973.00    54.43014
 1974.00    54.93393
 1975.00    51.42192
 1976.00    53.97268
 1977.00    54.04121
 1978.00    56.89532
 1979.00    55.28333
 1980.00    56.09642
 1981.00    56.43562
 1982.00    56.11233
 1983.00    57.95343
 1984.00    57.54099
 1985.00    57.07123
 1986.00    59.52877
 1987.00    58.73973
 1988.00    58.53006
 1989.00    59.18082
 1990.00    58.38082
 1991.00    58.37260
 1992.00    59.13661
 1993.00    59.15891
 1994.00    58.82692
 1995.00    60.27397
 1996.00    60.86339