1997

4.6

1955

6.0

1998

4.4

2000

3.4

1989

7.0

2001

4.8

1969

6.0

2013

0.0

2006

7.1

1970

3.7

2002

6.2

2006

6.3

2005

6.5

1998

6.8

2015

6.8

2014

7.5

2019

6.8

1983

6.7

2008

6.7

1977

5.6