|
| year | production | consumption |
| 1980 | 6,121.00 | 1,402.75 |
| 1981 | 4,762.00 | 1,510.45 |
| 1982 | 4,721.00 | 1,602.68 |
| 1983 | 4,737.26 | 1,633.84 |
| 1984 | 5,111.00 | 1,682.33 |
| 1985 | 5,360.07 | 1,793.25 |
| 1986 | 5,293.78 | 1,800.08 |
| 1987 | 5,248.72 | 1,819.93 |
| 1988 | 5,581.42 | 1,888.29 |
| 1989 | 5,966.89 | 1,964.13 |
| 1990 | 6,431.38 | 2,053.81 |
| 1991 | 6,654.64 | 2,102.13 |
| 1992 | 6,742.17 | 2,133.03 |
| 1993 | 6,643.49 | 2,157.20 |
| 1994 | 6,643.83 | 2,160.01 |
| 1995 | 6,894.20 | 2,226.34 |
| 1996 | 7,086.72 | 2,283.23 |
| 1997 | 7,339.84 | 2,351.72 |
| 1998 | 7,313.76 | 2,381.22 |
| 1999 | 7,240.13 | 2,422.73 |
| 2000 | 7,480.15 | 2,469.89 |
| 2001 | 7,473.85 | 2,568.46 |
| 2002 | 7,549.75 | 2,637.68 |
| 2003 | 8,040.56 | 2,684.77 |
| 2004 | 8,753.01 | 2,785.61 |
| 2005 | 9,461.69 | 2,936.06 |
| 2006 | 9,421.92 | 3,001.92 |
| 2007 | 9,711.26 | 3,083.49 |
| 2008 | 9,848.46 | 3,115.33 |
| 2009 | 9,628.61 | 3,224.00 |
| 2010 | 9,870.83 | 3,336.99 |
| 2011 | 8,566.76 | 3,368.00 |
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