1985

5.3

1981

6.7

2011

6.4

1990

5.7

2019

5.5

1997

4.5

1997

5.1

1990

6.0

1986

6.9

1989

6.3

1963

7.5

2004

7.1

2008

7.5

2008

6.8

2002

5.1

2012

6.4

1983

5.8

1957

7.0

1987

6.9

1970

6.2