1989

5.1

1988

5.2

1982

6.7

1990

6.0

1972

7.4

1984

6.5

1974

6.0

2008

7.1

1987

5.5

2006

3.3

2016

6.1

1987

5.3

1988

6.3

1986

6.2

1999

5.1

2005

5.3

1986

6.1

1993

6.5

1959

6.1

2001

6.8