|
| year | production | consumption |
| 1980 | | 31.70 |
| 1981 | | 33.00 |
| 1982 | | 34.40 |
| 1983 | .22 | 30.00 |
| 1984 | .41 | 31.00 |
| 1985 | .45 | 32.19 |
| 1986 | .47 | 34.20 |
| 1987 | .50 | 33.77 |
| 1988 | .55 | 35.59 |
| 1989 | .51 | 38.15 |
| 1990 | .79 | 36.00 |
| 1991 | .73 | 37.80 |
| 1992 | .90 | 37.31 |
| 1993 | | 40.42 |
| 1994 | 1.40 | 45.94 |
| 1995 | 1.10 | 50.96 |
| 1996 | 1.40 | 52.13 |
| 1997 | 1.60 | 56.26 |
| 1998 | 1.50 | 58.44 |
| 1999 | 1.40 | 67.33 |
| 2000 | 2.50 | 68.80 |
| 2001 | 3.38 | 81.25 |
| 2002 | | 82.77 |
| 2003 | | 83.87 |
| 2004 | | 84.64 |
| 2005 | | 86.76 |
| 2006 | | 90.77 |
| 2007 | | 90.76 |
| 2008 | 5.67 | 94.07 |
| 2009 | | 100.73 |
| 2010 | | 107.89 |
| 2011 | | 110.00 |
|
|