1951

7.0

2002

6.1

1999

7.6

1965

6.3

1998

7.0

1995

8.0

2009

6.8

2006

6.5

2001

6.7

2011

6.2

2001

7.9

2010

4.6

1993

7.9

2006

6.2

2020

6.4

1997

7.5

2002

7.7

2003

4.8

2007

7.3

1990

5.5