1971

7.5

2005

7.0

1984

7.0

2019

4.2

2017

6.3

1981

0.0

0.0

1995

6.5

1985

5.8

2007

6.1

1974

10.0

1977

6.9

2008

7.2

1998

5.7

1988

7.1

2008

6.6

2020

6.2

1999

6.1

2010

6.4

1990

6.9