|
| year | production | consumption |
| 1980 | 33,304.13 | 40,742.53 |
| 1981 | 32,233.09 | 40,439.80 |
| 1982 | 35,510.46 | 43,737.02 |
| 1983 | 35,704.17 | 43,823.80 |
| 1984 | 37,099.40 | 45,319.34 |
| 1985 | 34,039.38 | 43,649.32 |
| 1986 | 38,826.71 | 47,026.81 |
| 1987 | 40,586.00 | 48,852.23 |
| 1988 | 37,640.63 | 44,872.89 |
| 1989 | 37,807.07 | 45,551.91 |
| 1990 | 34,915.71 | 41,626.58 |
| 1991 | 27,906.45 | 33,121.48 |
| 1992 | 29,737.16 | 33,519.20 |
| 1993 | 28,225.89 | 32,206.34 |
| 1994 | 28,254.45 | 30,765.51 |
| 1995 | 30,559.17 | 32,736.23 |
| 1996 | 31,131.48 | 33,079.26 |
| 1997 | 32,747.47 | 37,642.83 |
| 1998 | 33,191.66 | 36,833.70 |
| 1999 | 27,906.78 | 31,913.68 |
| 2000 | 29,156.13 | 32,261.35 |
| 2001 | 29,358.14 | 34,665.77 |
| 2002 | 28,701.62 | 31,701.01 |
| 2003 | 30,106.62 | 35,124.34 |
| 2004 | 29,200.10 | 33,834.21 |
| 2005 | 27,221.58 | 32,335.20 |
| 2006 | 28,305.15 | 33,283.19 |
| 2007 | 31,364.06 | 37,165.53 |
| 2008 | 31,734.44 | 36,385.09 |
| 2009 | 29,967.44 | 33,241.30 |
| 2010 | 32,413.46 | 35,992.67 |
| 2011 | 41,679.50 | 45,184.84 |
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