| |
|
Year
|
Oil Yield
|
|
1978
|
4.58%
|
|
1979
|
4.42%
|
|
1980
|
4.51%
|
|
1981
|
4.10%
|
|
1982
|
6.35%
|
|
1983
|
1.33%
|
|
1984
|
5.22%
|
|
1985
|
3.35%
|
|
1986
|
5.04%
|
|
1987
|
2.75%
|
|
1988
|
3.35%
|
|
1989
|
5.18%
|
|
1990
|
3.12%
|
|
1991
|
2.81%
|
|
1992
|
2.28%
|
|
1993
|
2.94%
|
|
1994
|
4.27%
|
|
1995
|
4.56%
|
|
1996
|
4.82%
|
|
1997
|
4.72%
|
|
1998
|
3.33%
|
|
1999
|
6.43%
|
|
2000
|
5.92%
|
|
2001
|
4.15%
|
|
2002
|
2.32%
|
|
2003
|
3.97%
|
|
2004
|
3.99%
|
|
|
|
|
