1982

7.4

1983

7.4

1979

5.8

2004

6.2

2020

3.3

1985

6.2

2002

5.2

2004

5.1

1998

6.4

1968

8.1

1996

6.4

1987

6.8

1979

8.2

1959

5.6

1983

4.5

1992

6.4

2000

5.7

1964

6.3

2005

6.7

2012

0.0