1975

6.7

1992

6.3

2002

6.7

1982

6.1

1975

6.8

2005

5.1

2008

6.1

1984

5.7

1981

6.7

2017

8.5

2005

4.3

1972

6.1

1976

5.6

1972

6.3

1996

6.8

1972

6.9

2004

5.9

2004

6.4

2004

6.7

1998

7.2