1987

5.6

2006

5.5

1986

5.8

2011

9.7

2012

9.7

1999

4.4

2012

6.2

1987

7.1

1976

6.7

2003

7.3

1996

7.4

1971

4.7

1993

6.8

1991

6.2

1984

6.6

1987

6.8

1962

7.3

1989

7.5

1988

6.3

2008

6.7