1954

8.3

1956

7.5

1995

8.2

1996

7.7

2019

0.0

2017

6.8

1994

6.5

1990

6.3

1980

7.0

1992

6.4

2000

8.2

1974

7.9

1988

7.5

1971

6.7

2005

7.0

1992

4.5

1955

7.0

1981

7.4

1984

6.8

2009

6.3