1986

7.0

1991

6.1

1978

6.3

2003

6.2

2001

6.5

1993

6.6

1991

7.3

1987

6.8

1977

7.0

1981

6.5

1980

6.9

1986

5.5

1989

4.2

1988

6.4

2017

6.4

1987

7.5

1971

5.2

2006

6.1

1983

7.9

1997

7.4