|
| year | production | consumption |
| 1984 | 15.01 | 14.73 |
| 1985 | 26.67 | 18.98 |
| 1986 | 26.85 | 23.44 |
| 1987 | 29.44 | 28.38 |
| 1988 | 37.17 | 37.10 |
| 1989 | 50.40 | 50.13 |
| 1990 | 65.56 | 64.92 |
| 1991 | 78.22 | 78.66 |
| 1992 | 88.37 | 96.30 |
| 1993 | 121.27 | 116.45 |
| 1994 | 138.93 | 141.53 |
| 1995 | 165.67 | 163.89 |
| 1996 | 193.81 | 187.31 |
| 1997 | 215.49 | 197.05 |
| 1998 | 208.30 | 168.40 |
| 1999 | 205.93 | 176.39 |
| 2000 | 207.84 | 170.46 |
| 2001 | 209.58 | 171.81 |
| 2002 | 210.96 | 175.58 |
| 2003 | 200.14 | 165.78 |
| 2004 | 206.28 | 159.30 |
| 2005 | 202.24 | 162.88 |
| 2006 | 216.75 | 163.90 |
| 2007 | 214.25 | 171.21 |
| 2008 | 253.74 | 171.95 |
| 2009 | 297.73 | 180.16 |
| 2010 | 306.33 | 189.23 |
|
|