|
| year | production | consumption |
| 1984 | 68.77 | 76.97 |
| 1985 | 67.96 | 80.61 |
| 1986 | 67.73 | 72.03 |
| 1987 | 66.24 | 74.74 |
| 1988 | 66.12 | 67.99 |
| 1989 | 62.24 | 67.22 |
| 1990 | 55.92 | 66.06 |
| 1991 | 53.53 | 57.18 |
| 1992 | 56.03 | 57.75 |
| 1993 | 58.15 | 47.07 |
| 1994 | 51.87 | 46.50 |
| 1995 | 53.92 | 37.03 |
| 1996 | 48.92 | 35.12 |
| 1997 | 51.47 | 36.47 |
| 1998 | 53.39 | 37.82 |
| 1999 | 52.87 | 38.79 |
| 2000 | 53.30 | 40.74 |
| 2001 | 54.64 | 41.84 |
| 2002 | 63.48 | 46.57 |
| 2003 | 62.98 | 46.15 |
| 2004 | 59.49 | 48.80 |
| 2005 | 71.72 | 57.49 |
| 2006 | 71.47 | 59.63 |
| 2007 | 76.11 | 62.57 |
| 2008 | 77.58 | 62.81 |
| 2009 | 70.63 | 63.07 |
| 2010 | 79.34 | 61.86 |
|
|