1999

7.1

6.7

1993

7.7

2005

7.4

2002

8.2

1984

7.4

2006

6.1

2000

6.2

1995

7.6

1994

7.5

2006

7.8

1992

8.3

2010

10.0

1992

5.3

2001

7.6

2002

7.0

1987

6.4

2006

7.1

1992

7.1

1990

7.1