2005

7.7

1965

6.3

1999

7.5

1998

6.4

1997

7.6

1998

5.5

1996

6.4

2014

5.8

1992

7.1

2001

6.1

1972

6.7

1985

6.1

1992

6.8

2007

5.0

1988

7.6

1975

7.8

2003

5.7

2017

4.7

1994

5.0

2003

6.3