|
| year | production | consumption |
| 1984 | 40.89 | 74.20 |
| 1985 | 47.00 | 78.29 |
| 1986 | 52.37 | 76.00 |
| 1987 | 51.64 | 78.58 |
| 1988 | 56.00 | 82.95 |
| 1989 | 56.85 | 75.68 |
| 1990 | 58.35 | 81.41 |
| 1991 | 58.77 | 91.16 |
| 1992 | 58.86 | 84.21 |
| 1993 | 51.04 | 79.15 |
| 1994 | 54.38 | 84.61 |
| 1995 | 57.62 | 79.57 |
| 1996 | 47.76 | 84.10 |
| 1997 | 51.93 | 79.80 |
| 1998 | 49.58 | 81.87 |
| 1999 | 50.41 | 81.33 |
| 2000 | 48.14 | 78.92 |
| 2001 | 50.02 | 74.02 |
| 2002 | 49.61 | 73.95 |
| 2003 | 38.49 | 72.84 |
| 2004 | 33.53 | 74.13 |
| 2005 | 33.37 | 71.79 |
| 2006 | 48.37 | 66.07 |
| 2007 | 45.64 | 65.31 |
| 2008 | 47.03 | 62.82 |
| 2009 | 44.39 | 58.48 |
| 2010 | 46.27 | 58.57 |
|
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