|
| year | production | consumption |
| 1980 | 38.00 | 1,934.00 |
| 1981 | 37.00 | 1,874.00 |
| 1982 | 35.00 | 1,781.00 |
| 1983 | 45.00 | 1,750.00 |
| 1984 | 45.00 | 1,720.00 |
| 1985 | 45.00 | 1,705.00 |
| 1986 | 49.00 | 1,734.00 |
| 1987 | 67.00 | 1,815.00 |
| 1988 | 90.00 | 1,829.00 |
| 1989 | 82.00 | 1,897.00 |
| 1990 | 87.00 | 1,868.00 |
| 1991 | 80.00 | 1,856.00 |
| 1992 | 83.36 | 1,894.00 |
| 1993 | 82.72 | 1,891.00 |
| 1994 | 86.25 | 1,869.00 |
| 1995 | 93.37 | 1,942.00 |
| 1996 | 101.10 | 1,920.00 |
| 1997 | 111.59 | 1,934.00 |
| 1998 | 106.95 | 1,943.00 |
| 1999 | 82.00 | 1,891.00 |
| 2000 | 90.00 | 1,853.77 |
| 2001 | 78.46 | 1,832.44 |
| 2002 | 85.36 | 1,870.13 |
| 2003 | 95.85 | 1,859.66 |
| 2004 | 104.17 | 1,828.92 |
| 2005 | 114.61 | 1,780.57 |
| 2006 | 110.34 | 1,776.59 |
| 2007 | 107.94 | 1,728.70 |
| 2008 | 99.45 | 1,666.79 |
| 2009 | 82.78 | 1,544.24 |
| 2010 | 96.01 | 1,544.24 |
| 2011 | 99.18 | 1,453.61 |
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