2003

5.9

2012

4.3

2010

5.2

2006

8.2

2006

6.8

2019

7.7

2017

7.6

1972

8.7

1989

7.8

1997

7.6

2000

6.4

1985

7.5

1976

8.1

1996

7.9

2016

7.1

1999

6.3

2004

7.2

2018

7.5

2018

7.6

2004

6.0