1982

5.2

1997

8.0

1998

7.5

1998

6.1

1986

7.0

1992

7.2

2006

5.4

1977

7.0

1971

7.1

2001

6.0

1980

5.5

1991

6.7

2005

7.1

1997

5.0

1980

5.7

2016

10.0

2017

6.6

1984

6.5

2004

5.4

1983

4.4