1997

4.6

1955

6.0

2000

6.5

2005

6.5

1998

6.8

1977

6.0

1985

6.6

1971

7.1

1997

5.9

2015

6.8

1997

6.2

2003

5.8

2006

6.3

2002

3.4

1958

7.6

2000

3.3

1995

7.8

2006

5.3

1996

6.1

1974

6.1