2005

6.9

1992

7.3

1988

5.8

2007

5.6

2017

6.0

1996

7.6

1994

6.6

1995

6.1

1995

6.3

2002

6.3

1979

6.8

2017

6.8

2006

5.4

1994

6.4

2003

6.7

1942

3.0

2000

7.1

1997

5.6

2008

6.5

2007

6.4