2001

5.8

2002

5.4

2009

7.5

1963

7.6

1968

7.3

2007

7.6

2008

7.0

1996

5.8

1999

6.8

1993

7.2

1961

7.7

1996

6.3

2008

5.9

1977

6.8

2006

6.9

2015

6.3

2002

6.3

1988

6.7

1999

6.3

2003

7.3