1971

6.9

1985

7.0

1999

7.0

1999

7.0

2006

6.3

2016

4.0

2017

5.7

1989

4.4

2011

3.0

1964

6.0

1981

6.4

2000

6.4

2024

7.0

2014

0.0

2001

6.8

1997

6.6

1981

7.1

1988

6.7

2008

6.2

2005

6.1