1998

7.7

2007

5.9

2001

6.8

1958

6.4

2003

1.0

1999

6.8

2006

7.1

2000

5.3

2001

6.7

1993

6.7

2014

7.6

1980

6.6

1982

6.4

1988

7.5

1974

7.7

1959

8.1

1968

7.3

1962

7.2

1994

8.5

2000

7.0