1998

5.4

1981

7.0

2004

6.3

1996

6.5

1963

7.2

1973

4.6

2017

6.6

1953

5.9

1998

6.8

1967

6.2

2008

4.0

1997

5.2

1995

6.1

1966

2.0

1975

7.8

2010

6.1

1989

5.2

1949

6.3

1995

5.0

2020

5.3