|
| year | production | consumption |
| 1980 | .06 | 1.16 |
| 1981 | .10 | 1.20 |
| 1982 | .11 | 1.21 |
| 1983 | .22 | 1.32 |
| 1984 | .44 | .99 |
| 1985 | .55 | 1.10 |
| 1986 | .88 | 1.43 |
| 1987 | 2.02 | 20.76 |
| 1988 | 2.20 | 22.05 |
| 1989 | 2.20 | 19.84 |
| 1990 | 2.20 | 19.84 |
| 1991 | 2.20 | 19.84 |
| 1992 | 61.73 | 20.94 |
| 1993 | 50.71 | 12.13 |
| 1994 | 70.55 | 49.60 |
| 1995 | 74.96 | 57.32 |
| 1996 | 70.55 | 65.04 |
| 1997 | 59.52 | 78.26 |
| 1998 | 55.12 | 74.96 |
| 1999 | 55.12 | 72.75 |
| 2000 | 55.12 | 72.75 |
| 2001 | 93.25 | 60.18 |
| 2002 | 97.63 | 70.07 |
| 2003 | 73.11 | 45.99 |
| 2004 | 32.66 | 10.22 |
| 2005 | 94.00 | 40.68 |
| 2006 | 107.99 | 35.74 |
| 2007 | 116.03 | 32.95 |
| 2008 | 136.36 | 47.10 |
| 2009 | 53.51 | 23.67 |
| 2010 | 55.12 | 25.27 |
| 2011 | 55.12 | 25.27 |
|
|
