1997

6.4

1983

6.2

2019

5.8

2005

7.2

2014

6.8

1971

6.6

2010

2.7

2001

6.0

2005

4.4

2007

5.9

1995

6.5

2008

6.2

1998

7.0

1999

6.5

1996

7.5

1994

6.7

1997

7.5

2001

6.2

1996

6.5

2000

5.5