Tableau de données
| 1980 | 2,86 Bn | 1996 | 8,07 Bn | 2012 | 16,25 Bn |
| 1981 | 3,21 Bn | 1997 | 8,58 Bn | 2013 | 16,88 Bn |
| 1982 | 3,34 Bn | 1998 | 9,06 Bn | 2014 | 17,61 Bn |
| 1983 | 3,63 Bn | 1999 | 9,63 Bn | 2015 | 18,29 Bn |
| 1984 | 4,04 Bn | 2000 | 10,25 Bn | 2016 | 18,8 Bn |
| 1985 | 4,34 Bn | 2001 | 10,58 Bn | 2017 | 19,61 Bn |
| 1986 | 4,58 Bn | 2002 | 10,93 Bn | 2018 | 20,66 Bn |
| 1987 | 4,86 Bn | 2003 | 11,46 Bn | 2019 | 21,54 Bn |
| 1988 | 5,24 Bn | 2004 | 12,22 Bn | 2020 | 21,38 Bn |
| 1989 | 5,64 Bn | 2005 | 13,04 Bn | 2021 | 23,73 Bn |
| 1990 | 5,96 Bn | 2006 | 13,82 Bn | 2022 | 26,05 Bn |
| 1991 | 6,16 Bn | 2007 | 14,47 Bn | 2023 | 27,81 Bn |
| 1992 | 6,52 Bn | 2008 | 14,77 Bn | 2024 | 29,3 Bn |
| 1993 | 6,86 Bn | 2009 | 14,48 Bn | 2025 | 30,77 Bn |
| 1994 | 7,29 Bn | 2010 | 15,05 Bn | 2026 | 32,38 Bn |
| 1995 | 7,64 Bn | 2011 | 15,6 Bn | | |
Tableau de données
| 1980 | 2,86 Bn | 1996 | 8,07 Bn | 2012 | 16,25 Bn |
| 1981 | 3,21 Bn | 1997 | 8,58 Bn | 2013 | 16,88 Bn |
| 1982 | 3,34 Bn | 1998 | 9,06 Bn | 2014 | 17,61 Bn |
| 1983 | 3,63 Bn | 1999 | 9,63 Bn | 2015 | 18,29 Bn |
| 1984 | 4,04 Bn | 2000 | 10,25 Bn | 2016 | 18,8 Bn |
| 1985 | 4,34 Bn | 2001 | 10,58 Bn | 2017 | 19,61 Bn |
| 1986 | 4,58 Bn | 2002 | 10,93 Bn | 2018 | 20,66 Bn |
| 1987 | 4,86 Bn | 2003 | 11,46 Bn | 2019 | 21,54 Bn |
| 1988 | 5,24 Bn | 2004 | 12,22 Bn | 2020 | 21,38 Bn |
| 1989 | 5,64 Bn | 2005 | 13,04 Bn | 2021 | 23,73 Bn |
| 1990 | 5,96 Bn | 2006 | 13,82 Bn | 2022 | 26,05 Bn |
| 1991 | 6,16 Bn | 2007 | 14,47 Bn | 2023 | 27,81 Bn |
| 1992 | 6,52 Bn | 2008 | 14,77 Bn | 2024 | 29,3 Bn |
| 1993 | 6,86 Bn | 2009 | 14,48 Bn | 2025 | 30,77 Bn |
| 1994 | 7,29 Bn | 2010 | 15,05 Bn | 2026 | 32,38 Bn |
| 1995 | 7,64 Bn | 2011 | 15,6 Bn | | |
Tableau de données
| 1980 | 7,26 Bn | 1996 | 11,84 Bn | 2012 | 17,44 Bn |
| 1981 | 7,44 Bn | 1997 | 12,37 Bn | 2013 | 17,81 Bn |
| 1982 | 7,31 Bn | 1998 | 12,92 Bn | 2014 | 18,26 Bn |
| 1983 | 7,64 Bn | 1999 | 13,54 Bn | 2015 | 18,8 Bn |
| 1984 | 8,2 Bn | 2000 | 14,1 Bn | 2016 | 19,14 Bn |
| 1985 | 8,54 Bn | 2001 | 14,23 Bn | 2017 | 19,61 Bn |
| 1986 | 8,83 Bn | 2002 | 14,47 Bn | 2018 | 20,19 Bn |
| 1987 | 9,14 Bn | 2003 | 14,88 Bn | 2019 | 20,72 Bn |
| 1988 | 9,52 Bn | 2004 | 15,45 Bn | 2020 | 20,28 Bn |
| 1989 | 9,87 Bn | 2005 | 15,99 Bn | 2021 | 21,53 Bn |
| 1990 | 10,06 Bn | 2006 | 16,43 Bn | 2022 | 22,08 Bn |
| 1991 | 10,04 Bn | 2007 | 16,76 Bn | 2023 | 22,72 Bn |
| 1992 | 10,4 Bn | 2008 | 16,78 Bn | 2024 | 23,36 Bn |
| 1993 | 10,68 Bn | 2009 | 16,35 Bn | 2025 | 23,85 Bn |
| 1994 | 11,11 Bn | 2010 | 16,79 Bn | 2026 | 24,41 Bn |
| 1995 | 11,41 Bn | 2011 | 17,05 Bn | | |