|
| year | production | consumption |
| 1980 | 4,532.70 | 4,399.33 |
| 1981 | 4,767.50 | 4,563.57 |
| 1982 | 4,874.42 | 4,706.87 |
| 1983 | 5,723.20 | 5,202.91 |
| 1984 | 7,310.53 | 5,123.54 |
| 1985 | 9,766.48 | 5,101.50 |
| 1986 | 11,731.90 | 5,202.91 |
| 1987 | 14,836.01 | 4,315.55 |
| 1988 | 16,607.42 | 5,564.47 |
| 1989 | 20,207.57 | 5,173.15 |
| 1990 | 22,562.11 | 3,041.53 |
| 1991 | 22,037.41 | 5,511.15 |
| 1992 | 24,146.13 | 6,179.01 |
| 1993 | 23,394.35 | 6,352.98 |
| 1994 | 24,983.89 | 6,069.12 |
| 1995 | 28,373.49 | 5,046.51 |
| 1996 | 33,140.99 | 5,273.13 |
| 1997 | 35,926.53 | 5,563.70 |
| 1998 | 37,204.11 | 5,675.36 |
| 1999 | 36,105.11 | 4,382.24 |
| 2000 | 42,044.36 | 4,043.55 |
| 2001 | 47,885.51 | 3,581.41 |
| 2002 | 43,576.57 | 3,587.58 |
| 2003 | 55,146.97 | 4,104.45 |
| 2004 | 59,186.40 | 3,217.15 |
| 2005 | 65,106.73 | 4,568.89 |
| 2006 | 72,307.22 | 4,176.66 |
| 2007 | 77,053.99 | 3,288.42 |
| 2008 | 81,022.09 | 3,927.54 |
| 2009 | 80,255.98 | 5,049.39 |
| 2010 | 81,956.85 | 4,968.12 |
| 2011 | 94,581.63 | 5,532.06 |
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