1982

6.2

1996

6.7

1990

5.3

2012

6.0

1976

7.5

2011

7.1

2011

6.2

1986

6.5

2004

7.1

1957

8.1

1975

7.2

1999

5.6

2010

7.1

1999

7.2

2003

5.8

1964

7.0

2021

5.6

1986

6.6

1988

5.3

2011

5.5