2013

5.6

2001

5.9

2003

5.7

1988

7.3

1976

4.0

1977

4.0

1972

6.7

1975

6.7

2005

5.0

2005

6.2

2006

5.2

1988

6.3

2005

6.2

1994

7.4

2000

4.8

1984

6.0

1980

1.0

2008

7.5

2005

4.3

2021

4.0