1983

6.0

1980

5.8

2008

8.9

1990

5.8

1979

6.8

2016

7.3

1984

7.2

1979

6.9

2019

6.5

1981

6.1

1982

5.8

1982

7.1

1985

7.0

1987

5.5

1979

4.0

1979

5.7

2010

5.9

1972

7.1

2010

6.0