2012

2.6

2007

6.5

2005

7.7

2016

5.5

2003

5.1

2020

1.0

2006

6.1

2017

7.3

1988

6.3

1959

5.4

2007

6.5

1995

6.7

1981

6.4

2000

5.8

2006

6.0

1992

7.0

1999

6.6

1988

7.2

1962

3.4

2001

7.2