|
| year | production | consumption |
| 1980 | 1,620.29 | 1,620.29 |
| 1981 | 1,840.81 | 1,855.14 |
| 1982 | 2,333.82 | 2,483.73 |
| 1983 | 2,203.52 | 2,353.44 |
| 1984 | 2,750.27 | 2,864.91 |
| 1985 | 5,721.00 | 5,983.35 |
| 1986 | 6,107.45 | 6,297.05 |
| 1987 | 7,648.34 | 7,902.97 |
| 1988 | 8,056.42 | 8,464.36 |
| 1989 | 9,940.67 | 10,174.39 |
| 1990 | 13,732.01 | 14,227.94 |
| 1991 | 16,168.77 | 16,618.10 |
| 1992 | 16,987.24 | 17,820.12 |
| 1993 | 17,145.27 | 18,516.87 |
| 1994 | 18,857.10 | 20,636.46 |
| 1995 | 20,310.97 | 23,095.53 |
| 1996 | 23,915.28 | 27,819.82 |
| 1997 | 25,837.69 | 28,705.09 |
| 1998 | 22,225.57 | 24,590.43 |
| 1999 | 20,129.65 | 24,478.56 |
| 2000 | 19,605.43 | 24,173.74 |
| 2001 | 21,613.01 | 27,408.96 |
| 2002 | 21,607.49 | 27,707.66 |
| 2003 | 20,771.29 | 27,636.05 |
| 2004 | 22,112.19 | 30,968.07 |
| 2005 | 23,014.25 | 32,640.87 |
| 2006 | 21,021.75 | 33,155.99 |
| 2007 | 20,105.25 | 35,303.92 |
| 2008 | 20,157.40 | 38,287.11 |
| 2009 | 19,605.71 | 36,738.93 |
| 2010 | 20,220.80 | 39,340.39 |
| 2011 | 23,299.55 | 41,625.48 |
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