2009

6.8

2017

7.5

1961

6.6

2018

6.1

1996

6.4

2007

6.7

1999

5.5

2002

6.3

2006

6.8

2006

5.4

2008

7.3

2003

5.7

1992

6.6

2004

5.2

1999

6.5

1971

4.8

1990

6.0

2004

7.1

2003

8.1

1994

7.3