1989

6.9

1991

6.3

1964

7.3

1993

5.5

1997

6.6

1999

6.3

2002

6.0

2001

5.8

1968

7.6

1985

8.3

2014

5.7

1962

7.9

2004

7.6

1960

7.3

2002

6.3

1998

5.4

1986

7.0

2007

6.4

1975

5.8

1975

8.8