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| year | production | change |
| 1980 | 4.90 | NA |
| 1981 | 5.40 | 10.20% |
| 1982 | 5.80 | 7.41% |
| 1983 | 6.30 | 8.62% |
| 1984 | 6.50 | 3.17% |
| 1985 | 6.60 | 1.54% |
| 1986 | 7.30 | 10.61% |
| 1987 | 7.70 | 5.48% |
| 1988 | 8.50 | 10.39% |
| 1989 | 8.60 | 1.18% |
| 1990 | 9.10 | 5.81% |
| 1991 | 8.70 | -4.40% |
| 1992 | 9.20 | 5.75% |
| 1993 | 9.30 | 1.09% |
| 1994 | 10.00 | 7.53% |
| 1995 | 12.00 | 20.00% |
| 1996 | 12.00 | 0.00% |
| 1997 | 13.00 | 8.33% |
| 1998 | 13.00 | 0.00% |
| 1999 | 13.00 | 0.00% |
| 2000 | 12.00 | -7.69% |
| 2001 | 14.00 | 16.67% |
| 2002 | 15.00 | 7.14% |
| 2003 | 16.00 | 6.67% |
| 2004 | 17.00 | 6.25% |
| 2005 | 19.00 | 11.76% |
| 2006 | 19.00 | 0.00% |
| 2007 | 19.00 | 0.00% |
| 2008 | 20.00 | 5.26% |
| 2009 | 20.00 | 0.00% |
| 2010 | 22.00 | 10.00% |
| 2011 | 24.00 | 9.09% |
| 2012 | 26.00 | 8.33% |
| 2013 | 26.00 | 0.00% |
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