2009

7.5

1968

6.2

2007

6.5

1998

4.4

1996

7.1

1992

6.7

1998

6.3

2002

5.8

1991

6.5

1992

5.3

2002

5.1

2001

6.2

2017

6.4

2000

3.3

2006

5.9

2008

6.6

2008

7.3

1976

4.8

2008

6.5

2018

6.1