Year

Lower limit (billion $)

Actual value (billion $)

Upper limit (billion $)

Whether Optimal

1990

41.08

11.09

54.50

Insufficient

1991

34.40

21.71

49.82

Insufficient

1992

34.45

19.44

51.87

Insufficient

1993

39.95

21.20

60.29

Insufficient

1994

47.98

51.62

73.79

Optimal

1995

61.04

73.60

96.29

Optimal

1996

70.38

105.03

111.32

Optimal

1997

84.41

139.89

131.25

Excess

1998

86.97

144.96

136.29

Excess

1999

94.28

154.68

145.49

Excess

2000

93.92

165.57

151.71

Excess

2001

170.28

212.17

237.51

Optimal

2002

180.10

286.41

256.08

Excess

2003

205.06

403.25

294.75

Excess

2004

255.72

609.93

362.98

Excess

2005

304.85

818.87

433.25

Excess

2006

352.56

1066.34

506.72

Excess

2007

387.11

1528.25

545.17

Excess

2008

421.25

1946.03

643.56

Excess

2009

475.48

2399.15

726.36

Excess

2010

639.83

2847.34

953.61

Excess

2011

1417.41

3181.15

2564.40

Excess

2012

1522.51

3311.59

2758.16

Excess

2013

1840.96

3821.32

3315.36

Excess

2014

2646.10

3843.02

4308.29

Optimal

2015

2690.51

3330.36

4874.79

Optimal

2016

2869.67

3010.52

5335.97

Optimal