Show data table
| 1980 | 2.86T | 1996 | 8.07T | 2012 | 16.25T |
| 1981 | 3.21T | 1997 | 8.58T | 2013 | 16.88T |
| 1982 | 3.34T | 1998 | 9.06T | 2014 | 17.61T |
| 1983 | 3.63T | 1999 | 9.63T | 2015 | 18.29T |
| 1984 | 4.04T | 2000 | 10.25T | 2016 | 18.8T |
| 1985 | 4.34T | 2001 | 10.58T | 2017 | 19.61T |
| 1986 | 4.58T | 2002 | 10.93T | 2018 | 20.66T |
| 1987 | 4.86T | 2003 | 11.46T | 2019 | 21.54T |
| 1988 | 5.24T | 2004 | 12.22T | 2020 | 21.38T |
| 1989 | 5.64T | 2005 | 13.04T | 2021 | 23.73T |
| 1990 | 5.96T | 2006 | 13.82T | 2022 | 26.05T |
| 1991 | 6.16T | 2007 | 14.47T | 2023 | 27.81T |
| 1992 | 6.52T | 2008 | 14.77T | 2024 | 29.3T |
| 1993 | 6.86T | 2009 | 14.48T | 2025 | 30.77T |
| 1994 | 7.29T | 2010 | 15.05T | 2026 | 32.38T |
| 1995 | 7.64T | 2011 | 15.6T | | |
Show data table
| 1980 | 2.86T | 1996 | 8.07T | 2012 | 16.25T |
| 1981 | 3.21T | 1997 | 8.58T | 2013 | 16.88T |
| 1982 | 3.34T | 1998 | 9.06T | 2014 | 17.61T |
| 1983 | 3.63T | 1999 | 9.63T | 2015 | 18.29T |
| 1984 | 4.04T | 2000 | 10.25T | 2016 | 18.8T |
| 1985 | 4.34T | 2001 | 10.58T | 2017 | 19.61T |
| 1986 | 4.58T | 2002 | 10.93T | 2018 | 20.66T |
| 1987 | 4.86T | 2003 | 11.46T | 2019 | 21.54T |
| 1988 | 5.24T | 2004 | 12.22T | 2020 | 21.38T |
| 1989 | 5.64T | 2005 | 13.04T | 2021 | 23.73T |
| 1990 | 5.96T | 2006 | 13.82T | 2022 | 26.05T |
| 1991 | 6.16T | 2007 | 14.47T | 2023 | 27.81T |
| 1992 | 6.52T | 2008 | 14.77T | 2024 | 29.3T |
| 1993 | 6.86T | 2009 | 14.48T | 2025 | 30.77T |
| 1994 | 7.29T | 2010 | 15.05T | 2026 | 32.38T |
| 1995 | 7.64T | 2011 | 15.6T | | |
Show data table
| 1980 | 7.26T | 1996 | 11.84T | 2012 | 17.44T |
| 1981 | 7.44T | 1997 | 12.37T | 2013 | 17.81T |
| 1982 | 7.31T | 1998 | 12.92T | 2014 | 18.26T |
| 1983 | 7.64T | 1999 | 13.54T | 2015 | 18.8T |
| 1984 | 8.2T | 2000 | 14.1T | 2016 | 19.14T |
| 1985 | 8.54T | 2001 | 14.23T | 2017 | 19.61T |
| 1986 | 8.83T | 2002 | 14.47T | 2018 | 20.19T |
| 1987 | 9.14T | 2003 | 14.88T | 2019 | 20.72T |
| 1988 | 9.52T | 2004 | 15.45T | 2020 | 20.28T |
| 1989 | 9.87T | 2005 | 15.99T | 2021 | 21.53T |
| 1990 | 10.06T | 2006 | 16.43T | 2022 | 22.08T |
| 1991 | 10.04T | 2007 | 16.76T | 2023 | 22.72T |
| 1992 | 10.4T | 2008 | 16.78T | 2024 | 23.36T |
| 1993 | 10.68T | 2009 | 16.35T | 2025 | 23.85T |
| 1994 | 11.11T | 2010 | 16.79T | 2026 | 24.41T |
| 1995 | 11.41T | 2011 | 17.05T | | |