|
| year | production | consumption |
| 1980 | 28.00 | 28.00 |
| 1981 | 33.00 | 33.00 |
| 1982 | 41.00 | 41.00 |
| 1983 | 51.00 | 51.00 |
| 1984 | 47.00 | 47.00 |
| 1985 | 55.00 | 55.00 |
| 1986 | 70.00 | 70.00 |
| 1987 | 79.80 | 79.80 |
| 1988 | 73.10 | 73.10 |
| 1989 | 98.54 | 98.54 |
| 1990 | 99.00 | 99.00 |
| 1991 | 124.00 | 124.00 |
| 1992 | 116.89 | 116.89 |
| 1993 | 139.85 | 139.85 |
| 1994 | 150.09 | 146.56 |
| 1995 | 147.27 | 129.61 |
| 1996 | 145.50 | 127.84 |
| 1997 | 176.22 | 158.56 |
| 1998 | 247.56 | 231.67 |
| 1999 | 197.41 | 181.52 |
| 2000 | 321.72 | 221.43 |
| 2001 | 493.35 | 223.90 |
| 2002 | 529.73 | 230.96 |
| 2003 | 557.98 | 225.66 |
| 2004 | 607.42 | 236.26 |
| 2005 | 698.88 | 323.84 |
| 2006 | 837.32 | 380.34 |
| 2007 | 848.97 | 384.31 |
| 2008 | 849.54 | 477.46 |
| 2009 | 874.58 | 520.19 |
| 2010 | 957.04 | 620.84 |
| 2011 | 936.55 | 619.43 |
|
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