From: The potential cost of regulation of methane and nitrous oxide emissions in U.S. agriculture
Years | Hyperbolic | Directional distance function |
---|---|---|
1992 | 1,055,286 | 952,172 |
1993 | 1,772,681 | 1,558,840 |
1994 | 2,801,434 | 2,389,808 |
1995 | 4,174,007 | 3,379,392 |
1996 | 2,982,051 | 2,570,677 |
1997 | 2,909,866 | 2,491,566 |
1998 | 2,627,978 | 2,189,271 |
1999 | 2,404,276 | 2,087,126 |
2000 | 3,408,032 | 2,829,113 |
2001 | 3,159,689 | 2,710,648 |
2002 | 2,820,788 | 2,394,933 |
2003 | 3,018,292 | 2,668,993 |
Sum | 33,134,381 | 28,222,545 |