1996

6.8

1988

7.3

2005

4.9

1984

5.7

2005

4.3

1972

6.3

2016

4.6

2004

6.8

2002

6.2

1983

6.2

1986

7.0

2017

4.4

1978

6.3

2002

6.0

2000

5.4

1979

7.3

1994

6.7

2008

5.7

1987

7.2

1996

5.9