1997

6.6

2008

7.4

1965

4.6

1950

8.3

2006

6.6

2002

7.3

2000

6.5

2013

8.1

2004

5.9

2007

7.2

2008

5.4

1989

5.9

2013

6.1

2008

5.4

2008

4.0

2018

5.5

2009

5.6

1998

6.8

2001

7.9

1998

7.1