1999

6.2

1969

7.1

1952

6.7

2006

5.5

2012

5.2

1951

7.2

1989

6.3

2012

6.0

2020

6.9

1997

6.9

2002

6.3

2001

4.9

2010

4.6

1986

6.6

2005

5.1

1967

6.5

2007

4.0

2009

8.3

1959

7.2

2008

6.4