|
| year | production | consumption |
| 1980 | 41.89 | 83.78 |
| 1981 | 61.73 | 111.33 |
| 1982 | 73.85 | 139.99 |
| 1983 | 78.26 | 124.56 |
| 1984 | 95.90 | 139.99 |
| 1985 | 94.80 | 149.91 |
| 1986 | 108.03 | 125.66 |
| 1987 | 81.57 | 84.88 |
| 1988 | 71.65 | 74.96 |
| 1989 | 71.65 | 91.49 |
| 1990 | 76.06 | 91.49 |
| 1991 | 82.67 | 97.00 |
| 1992 | 80.47 | 95.90 |
| 1993 | 63.93 | 78.26 |
| 1994 | 58.42 | 71.65 |
| 1995 | 63.93 | 80.47 |
| 1996 | 58.42 | 65.04 |
| 1997 | 54.01 | 63.93 |
| 1998 | 57.32 | 66.14 |
| 1999 | 207.23 | 211.64 |
| 2000 | 639.34 | 639.34 |
| 2001 | 707.68 | 707.68 |
| 2002 | 536.83 | 541.23 |
| 2003 | 943.58 | 943.58 |
| 2004 | 514.78 | 514.78 |
| 2005 | 632.73 | 632.73 |
| 2006 | 807.99 | 807.99 |
| 2007 | 854.29 | 854.29 |
| 2008 | 737.45 | 737.45 |
| 2009 | 683.43 | 683.43 |
| 2010 | 756.19 | 756.19 |
| 2011 | 1,559.77 | 1,559.77 |
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