1989

7.0

1992

6.7

1998

6.6

2006

6.7

1987

6.5

2004

7.3

2007

6.3

1999

7.6

1992

6.8

1989

7.8

1990

7.5

2013

5.3

2011

5.8

1986

6.3

1988

6.2

1983

4.6

2005

6.8

1984

4.8

1995

6.2

1962

6.6