1975

6.7

2017

6.7

1987

6.3

1997

6.6

1994

5.8

2005

6.2

1971

7.1

1988

6.7

2001

5.8

2022

5.1

1974

7.5

1988

7.3

1974

6.8

1980

7.3

2002

5.4

2005

5.9

2008

6.4

2008

6.7

1995

5.4

2003

6.6