|
| year | production | consumption |
| 1980 | 180.00 | 180.00 |
| 1981 | 110.00 | 110.00 |
| 1982 | 120.00 | 88.00 |
| 1983 | 140.00 | 112.00 |
| 1984 | 162.00 | 122.00 |
| 1985 | 180.00 | 143.00 |
| 1986 | 198.00 | 168.00 |
| 1987 | 189.00 | 160.75 |
| 1988 | 194.23 | 156.80 |
| 1989 | 211.90 | 164.76 |
| 1990 | 219.00 | 175.00 |
| 1991 | 230.95 | 175.15 |
| 1992 | 239.14 | 174.00 |
| 1993 | 224.60 | 168.10 |
| 1994 | 225.66 | 173.39 |
| 1995 | 223.90 | 171.28 |
| 1996 | 226.72 | 184.34 |
| 1997 | 232.02 | 192.47 |
| 1998 | 224.60 | 192.47 |
| 1999 | 183.64 | 149.74 |
| 2000 | 211.89 | 183.64 |
| 2001 | 218.25 | 190.35 |
| 2002 | 219.31 | 197.06 |
| 2003 | 194.23 | 167.75 |
| 2004 | 284.64 | 209.42 |
| 2005 | 399.06 | 205.89 |
| 2006 | 465.98 | 165.80 |
| 2007 | 539.61 | 187.88 |
| 2008 | 561.51 | 194.23 |
| 2009 | 561.54 | 212.24 |
| 2010 | 593.79 | 241.70 |
| 2011 | 277.40 | 147.93 |
|
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