Năm t
Năm t-1
1980 25.2
1981 69.6 1980 25.2
1982 95.4 1981 69.6
1983 49.5 1982 95.4
1984 64.9 1983 49.5
1985 91.6 1984 64.9
1986 453.5 1985 91.6
1987 360.4 1986 453.5
1988 374.4 1987 360.4
1989 95.8 1988 374.4
1990 36 1989 95.8
1991 81.8 1990 36
1992 37.7 1991 81.8
1993 8.4 1992 37.7
1994 9.5 1993 8.4
1995 16.9 1994 9.5
1996 5.6 1995 16.9
1997 3.1 1996 5.6
1998 8.1 1997 3.1
1999 4.1 1998 8.1
2000 -1.8 1999 4.1
2001 -0.3 2000 -1.8
2002 4.1 2001 -0.3
2003 3.3 2002 4.1
2004 7.9 2003 3.3
2005 8.4 2004 7.9
2006 7.5 2005 8.4
2007 8.3 2006 7.5
2008 23.1 2007 8.3
2009 6.9 2008 23.1
2010 11.8 2009 6.9