1941

6.9

1965

7.1

1995

8.0

1981

7.2

1944

5.5

2001

5.6

2007

7.4

2017

6.4

1990

7.3

1998

4.2

2017

8.0

2002

7.0

2017

6.3

1999

6.1

1992

6.6

1972

7.4

1979

5.8

1994

6.8

1976

6.6

1986

7.4