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| year | production | change |
| 1980 | 3.90 | NA |
| 1981 | 4.20 | 7.69% |
| 1982 | 4.40 | 4.76% |
| 1983 | 4.70 | 6.82% |
| 1984 | 4.90 | 4.26% |
| 1985 | 5.20 | 6.12% |
| 1986 | 5.30 | 1.92% |
| 1987 | 5.60 | 5.66% |
| 1988 | 6.30 | 12.50% |
| 1989 | 7.50 | 19.05% |
| 1990 | 8.50 | 13.33% |
| 1991 | 9.10 | 7.06% |
| 1992 | 9.40 | 3.30% |
| 1993 | 10.00 | 6.38% |
| 1994 | 12.00 | 20.00% |
| 1995 | 14.00 | 16.67% |
| 1996 | 17.00 | 21.43% |
| 1997 | 19.00 | 11.76% |
| 1998 | 21.00 | 10.53% |
| 1999 | 23.00 | 9.52% |
| 2000 | 26.00 | 13.04% |
| 2001 | 30.00 | 15.38% |
| 2002 | 35.00 | 16.67% |
| 2003 | 39.00 | 11.43% |
| 2004 | 44.00 | 12.82% |
| 2005 | 51.00 | 15.91% |
| 2006 | 58.00 | 13.73% |
| 2007 | 64.00 | 10.34% |
| 2008 | 70.00 | 9.38% |
| 2009 | 80.00 | 14.29% |
| 2010 | 91.00 | 13.75% |
| 2011 | 101.00 | 10.99% |
| 2012 | 115.00 | 13.86% |
| 2013 | 122.00 | 6.09% |
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