1980

5.2

1985

8.1

1995

7.1

2002

6.9

1996

6.2

2008

5.9

2006

7.0

2018

6.9

2008

6.3

2006

7.2

1965

8.3

2005

5.2

2009

5.9

2006

6.8

1995

8.4

2010

2.6

2017

4.9

1991

5.9

1989

7.0

2010

7.0