date      value       date      elev
1949-06-01   1385.8    1994-02-16  1392.68
1956-06-08   1384.9    1994-05-09  1393.59
1956-09-24   1384.3    1994-07-26  1394.04
1957-04-29   1384.8    1994-10-13  1396.68
1957-10-04   1384.50   1995-01-23  1397.94
1958-06-23   1384.32   1995-05-10  1401.32
1958-10-03   1383.84   1995-07-24  1401.30
1959-10-09   1383.21   1995-10-16  1400.96
1960-05-07   1383.77   1996-02-20  1401.16
1960-06-15   1383.69   1996-05-09  1403.56
1960-09-30   1382.76   1996-07-22  1403.83
1964-05-19   1381.58   1996-10-15  1403.11
1964-10-02   1382.58   1997-02-10  1403.26
1965-05-20   1383.53   1997-05-12  1406.47
1965-10-02   1383.69   1997-07-28  1406.68
1966-05-24   1384.72   1997-10-06  1406.00
1966-06-22   1384.60   1998-01-07  1405.90
1966-08-11   1384.57   1998-04-27  1407.22
1966-10-13   1384.72   1998-07-29  1406.50
1967-05-15   1387.06   1998-10-21  1405.58
1967-10-26   1384.51   1999-02-25  1405.91
1968-05-17   1385.11   1999-04-19  1407.37
1968-10-24   1384.95   1999-05-11  1407.80
1969-05-21   1384.95   1999-07-20  1408.02
1969-10-08   1383.95   1999-10-19  1408.00
1970-05-19   1385.01   2000-02-16  1407.82
1970-10-05   1384.05   2000-05-09  1408.11
1971-05-19   1385.11   2000-08-02  1409.61
1971-08-19   1384.87   2000-10-11  1409.25
1972-05-17   1385.26   2001-02-13  1409.87
1972-08-15   1384.49   2001-05-10  1411.07
1972-11-15   1384.49   2001-07-17  1411.69
1973-05-17   1384.06   2001-10-02  1411.77
1973-08-15   1383.45   2002-02-05  1411.93
1973-11-15   1383.65   2002-05-07  1412.25
1974-02-14   1383.83   2002-07-02  1413.48
1974-05-24   1385.45   2002-10-02  1413.49
1974-08-29   1384.64   2002-10-31  1413.25
1974-12-12   1384.43   2002-11-30  1413.20
1975-06-18   1385.04   2002-12-15  1413.20
1975-10-21   1384.13   2003-01-24  1413.27
1976-01-20   1383.20   2003-02-28  1413.26
1976-05-04   1384.56   2003-03-31  1413.44
1976-07-22   1383.78   2003-04-30  1413.69
1977-10-17   1382.55   2003-05-31  1414.22
1978-01-17   1382.52   2003-06-30  1414.73
1978-05-09   1383.77   2003-07-31  1415.18
1978-08-17   1382.41   2003-08-31  1415.03
1978-10-17   1382.23   2003-09-30  1414.68
1979-01-17   1382.07   2003-10-31  1414.46
1979-05-16   1384.16   2003-11-30  1414.41
1979-08-08   1384.16   2003-12-31  1414.52
  --           --      2004-01-31  1414.68
  --           --      2004-02-29  1414.73
  --           --      2004-03-31  1416.21
  --           --      2004-04-30  1417.63
  --           --      2004-05-31  1418.63
  --           --      2004-06-15  1419.54