|
| year | production | consumption |
| 1980 | .30 | 224.00 |
| 1981 | .30 | 214.40 |
| 1982 | | 199.00 |
| 1983 | 11.00 | 214.00 |
| 1984 | 18.00 | 233.00 |
| 1985 | 34.00 | 224.83 |
| 1986 | 35.00 | 234.38 |
| 1987 | 33.00 | 258.99 |
| 1988 | 36.00 | 283.38 |
| 1989 | 40.00 | 348.59 |
| 1990 | 43.72 | 406.51 |
| 1991 | 46.23 | 436.54 |
| 1992 | 50.69 | 475.53 |
| 1993 | 52.30 | 544.51 |
| 1994 | 55.71 | 603.17 |
| 1995 | 51.40 | 678.68 |
| 1996 | 60.93 | 749.41 |
| 1997 | 71.74 | 781.23 |
| 1998 | 75.02 | 736.55 |
| 1999 | 83.64 | 734.26 |
| 2000 | 109.66 | 724.94 |
| 2001 | 113.76 | 701.61 |
| 2002 | 127.16 | 763.27 |
| 2003 | 158.99 | 832.32 |
| 2004 | 154.98 | 915.47 |
| 2005 | 183.38 | 930.89 |
| 2006 | 204.13 | 952.09 |
| 2007 | 213.41 | 941.34 |
| 2008 | 228.83 | 729.12 |
| 2009 | 237.94 | 973.55 |
| 2010 | 241.80 | 1,010.54 |
| 2011 | 224.13 | 942.00 |
|
|