2000

5.2

2006

7.1

1985

6.9

1969

6.4

2009

8.5

2017

6.1

2007

7.4

2020

6.0

2008

5.6

1998

6.1

2010

6.3

2002

7.3

2011

7.5

2008

7.3

1993

7.3

1965

6.8

1988

5.5

1988

5.2

1994

4.6