|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 33.66 | 65.61 |
| 1987 | 33.50 | 79.06 |
| 1988 | 35.06 | 86.25 |
| 1989 | 33.95 | 92.04 |
| 1990 | 34.90 | 91.30 |
| 1991 | 35.30 | 88.03 |
| 1992 | 29.36 | 91.35 |
| 1993 | 33.72 | 112.41 |
| 1994 | 36.02 | 120.96 |
| 1995 | 34.26 | 125.93 |
| 1996 | 34.55 | 138.38 |
| 1997 | 35.49 | 136.13 |
| 1998 | 32.77 | 133.38 |
| 1999 | 33.28 | 140.13 |
| 2000 | 50.50 | 148.16 |
| 2001 | 49.79 | 147.20 |
| 2002 | 66.20 | 147.85 |
| 2003 | 66.71 | 152.41 |
| 2004 | 73.48 | 158.76 |
| 2005 | 72.46 | 152.74 |
| 2006 | 69.19 | 147.91 |
| 2007 | 73.52 | 164.59 |
| 2008 | 68.49 | 159.52 |
| 2009 | 65.71 | 150.69 |
| 2010 | 67.25 | 136.45 |
|
|