|
| year | production | change |
| 1980 | 22.43 | NA |
| 1981 | 22.44 | 0.01 % |
| 1982 | 15.10 | -32.68 % |
| 1983 | 11.92 | -21.07 % |
| 1984 | 11.29 | -5.31 % |
| 1985 | 8.64 | -23.45 % |
| 1986 | 12.04 | 39.28 % |
| 1987 | 10.84 | -9.92 % |
| 1988 | 12.86 | 18.58 % |
| 1989 | 12.81 | -0.37 % |
| 1990 | 15.92 | 24.29 % |
| 1991 | 19.75 | 24.04 % |
| 1992 | 20.39 | 3.27 % |
| 1993 | 20.11 | -1.39 % |
| 1994 | 20.39 | 1.40 % |
| 1995 | 20.66 | 1.32 % |
| 1996 | 20.82 | 0.76 % |
| 1997 | 21.24 | 2.06 % |
| 1998 | 21.42 | 0.81 % |
| 1999 | 20.18 | -5.78 % |
| 2000 | 21.59 | 7.01 % |
| 2001 | 20.95 | -3.00 % |
| 2002 | 20.27 | -3.23 % |
| 2003 | 23.05 | 13.71 % |
| 2004 | 24.16 | 4.82 % |
| 2005 | 25.44 | 5.30 % |
| 2006 | 24.61 | -3.26 % |
| 2007 | 23.74 | -3.55 % |
| 2008 | 25.17 | 6.03 % |
| 2009 | 22.84 | -9.26 % |
| 2010 | 24.74 | 8.35 % |
|
|