|
| year | production | consumption |
| 1980 | 282.00 | 17.15 |
| 1981 | 319.00 | 16.66 |
| 1982 | 324.00 | 19.56 |
| 1983 | 375.00 | 20.91 |
| 1984 | 414.00 | 24.62 |
| 1985 | 498.00 | 29.84 |
| 1986 | 560.00 | 29.57 |
| 1987 | 582.00 | 26.62 |
| 1988 | 617.00 | 26.28 |
| 1989 | 641.00 | 31.59 |
| 1990 | 685.00 | 38.64 |
| 1991 | 700.00 | 38.69 |
| 1992 | 740.00 | 39.51 |
| 1993 | 775.83 | 38.90 |
| 1994 | 810.00 | 39.69 |
| 1995 | 851.29 | 42.27 |
| 1996 | 883.39 | 46.66 |
| 1997 | 904.00 | 48.57 |
| 1998 | 899.84 | 50.51 |
| 1999 | 910.00 | 53.40 |
| 2000 | 970.00 | 52.54 |
| 2001 | 913.00 | 54.72 |
| 2002 | 896.72 | 57.23 |
| 2003 | 819.00 | 58.43 |
| 2004 | 750.96 | 63.91 |
| 2005 | 774.30 | 72.06 |
| 2006 | 737.65 | 78.03 |
| 2007 | 710.36 | 90.96 |
| 2008 | 757.32 | 121.64 |
| 2009 | 812.51 | 108.64 |
| 2010 | 864.59 | 113.55 |
| 2011 | 885.68 | 98.00 |
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