1999

7.6

1999

7.1

6.7

1993

7.7

1986

4.0

1979

6.9

1983

5.2

1984

7.4

1995

7.6

1994

7.5

1987

7.3

2010

10.0

2002

7.5

2000

6.2

2005

7.4

2002

8.2

2006

6.1

2005

8.8

1988

5.7

1992

5.3