2001

7.4

1991

7.2

1988

6.8

1988

5.8

2007

6.2

2001

7.3

1991

6.6

1974

5.3

2003

5.4

1991

7.4

2006

5.8

2003

7.3

2000

8.5

1983

7.6

2004

8.4

2017

9.0

1997

5.6

2005

6.7

1978

7.7

1990

7.8