1966

6.1

1965

7.1

1976

5.2

1965

6.0

2017

6.7

1999

6.1

2006

5.2

2017

7.4

1978

6.3

1988

6.3

1997

6.6

1994

5.8

1975

6.8

1989

7.1

1988

4.5

2000

6.1

2008

6.6

2001

5.8

1967

5.2

2017

4.7