1955

7.2

2001

7.4

1971

6.4

2007

7.2

1993

5.7

1992

7.5

2006

6.8

2004

7.6

2019

6.8

2008

7.0

2008

4.9

1956

7.9

2002

6.5

1975

5.9

2003

6.6

1983

7.1

1990

5.0

1961

6.1

1981

7.0

1972

6.5