1987

6.9

2010

6.0

1996

6.0

1985

6.7

1981

6.5

1990

6.3

1961

6.5

2003

5.2

1994

5.4

2017

4.7

1974

6.1

1999

8.0

2013

6.3

2014

0.0

1990

6.3

1997

7.4

1984

7.7

1998

6.8

2020

6.3

2004

7.1