|
| year | production | consumption |
| 1980 | 5,778.32 | 10,575.58 |
| 1981 | 6,271.05 | 10,928.31 |
| 1982 | 6,995.27 | 11,940.24 |
| 1983 | 7,426.27 | 12,873.89 |
| 1984 | 8,288.28 | 15,416.93 |
| 1985 | 8,501.03 | 18,643.39 |
| 1986 | 8,147.18 | 18,798.82 |
| 1987 | 7,588.31 | 19,315.80 |
| 1988 | 8,081.04 | 19,204.47 |
| 1989 | 7,353.52 | 19,306.98 |
| 1990 | 5,065.12 | 16,968.98 |
| 1991 | 5,718.79 | 19,582.56 |
| 1992 | 5,215.04 | 18,756.93 |
| 1993 | 5,065.12 | 18,982.90 |
| 1994 | 5,659.27 | 19,680.67 |
| 1995 | 5,730.92 | 20,771.96 |
| 1996 | 5,296.61 | 21,344.05 |
| 1997 | 6,224.75 | 21,771.75 |
| 1998 | 6,080.35 | 21,163.28 |
| 1999 | 6,239.08 | 22,818.95 |
| 2000 | 7,502.33 | 24,145.03 |
| 2001 | 6,232.47 | 23,725.05 |
| 2002 | 5,670.29 | 22,091.42 |
| 2003 | 5,121.34 | 22,354.88 |
| 2004 | 5,959.10 | 24,183.92 |
| 2005 | 6,894.96 | 23,757.57 |
| 2006 | 6,494.82 | 23,616.47 |
| 2007 | 6,575.29 | 24,658.04 |
| 2008 | 7,288.48 | 24,610.20 |
| 2009 | 6,293.10 | 19,470.57 |
| 2010 | 5,969.02 | 25,823.16 |
| 2011 | 6,005.39 | 27,569.97 |
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