|
| year | production | consumption |
| 1980 | 32.21 | 32.00 |
| 1981 | 49.09 | 49.00 |
| 1982 | 72.22 | 73.00 |
| 1983 | 77.55 | 77.38 |
| 1984 | 82.25 | 82.25 |
| 1985 | 87.16 | 87.00 |
| 1986 | 59.33 | 59.00 |
| 1987 | 59.08 | 58.83 |
| 1988 | 71.16 | 71.20 |
| 1989 | 80.45 | 80.00 |
| 1990 | 82.00 | 82.00 |
| 1991 | 84.00 | 84.00 |
| 1992 | 82.92 | 82.99 |
| 1993 | 94.22 | 94.19 |
| 1994 | 95.85 | 95.85 |
| 1995 | 98.11 | 101.57 |
| 1996 | 94.57 | 113.96 |
| 1997 | 83.34 | 118.38 |
| 1998 | 61.52 | 117.74 |
| 1999 | 48.24 | 124.52 |
| 2000 | 41.88 | 141.72 |
| 2001 | 28.78 | 148.32 |
| 2002 | 29.59 | 151.43 |
| 2003 | 23.77 | 152.14 |
| 2004 | 30.19 | 156.52 |
| 2005 | 20.20 | 147.65 |
| 2006 | 17.94 | 167.00 |
| 2007 | 16.14 | 180.39 |
| 2008 | 15.47 | 182.86 |
| 2009 | 13.81 | 177.25 |
| 2010 | 13.67 | 194.44 |
| 2011 | 12.25 | 171.07 |
|
|
