1962

7.3

2001

7.8

1999

5.7

1951

7.7

1988

7.5

1971

8.2

1983

7.2

1986

7.9

1972

8.7

1974

8.6

2002

6.7

1971

7.5

2005

6.7

1971

7.2

1999

7.2

2007

6.9

1975

1.0

2017

7.4

1956

4.6

1981

5.8