1983

6.0

1969

8.2

1987

7.5

1984

7.2

1973

5.9

2014

5.2

1983

7.3

1999

7.1

2003

7.1

2002

7.1

1995

7.6

2005

7.7

2003

8.1

2006

9.0

1990

7.0

1987

0.0

1989

4.5

2001

8.1

2018

6.5

2020

0.0