1967

7.5

2020

6.5

1994

7.1

2007

7.5

1990

7.2

2015

0.0

1991

6.9

2004

6.0

1975

6.9

1987

7.0

1998

7.1

2005

7.3

1989

7.4

2006

5.0

2009

0.0

1994

6.8

2006

7.7

1969

7.2

2003

0.0

1996

7.3