|
| year | production | consumption |
| 1980 | 19.84 | 2,830.74 |
| 1981 | 30.86 | 2,451.54 |
| 1982 | 14.33 | 2,730.43 |
| 1983 | 14.33 | 3,473.38 |
| 1984 | 14.33 | 4,182.17 |
| 1985 | 13.23 | 4,903.08 |
| 1986 | 13.23 | 5,053.00 |
| 1987 | 27.56 | 4,963.71 |
| 1988 | 33.07 | 4,932.84 |
| 1989 | 22.05 | 4,455.54 |
| 1990 | 12.13 | 4,463.26 |
| 1991 | 30.86 | 4,175.56 |
| 1992 | 40.79 | 3,870.22 |
| 1993 | 4.41 | 3,960.61 |
| 1994 | .53 | 4,326.00 |
| 1995 | | 4,178.86 |
| 1996 | | 4,447.83 |
| 1997 | | 3,807.38 |
| 1998 | | 3,636.53 |
| 1999 | | 3,504.25 |
| 2000 | | 3,538.42 |
| 2001 | | 3,966.12 |
| 2002 | | 4,003.60 |
| 2003 | | 3,728.02 |
| 2004 | | 4,117.13 |
| 2005 | | 3,703.77 |
| 2006 | | 3,836.04 |
| 2007 | | 3,831.63 |
| 2008 | | 3,310.24 |
| 2009 | | 2,519.88 |
| 2010 | | 3,401.73 |
| 2011 | | 3,464.57 |
|
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