1969

7.1

1995

8.0

1996

7.0

2008

9.0

1974

8.8

2008

6.4

2004

7.3

1987

0.0

1983

0.0

1988

0.0

2011

7.7

2009

5.8

2015

3.6

2008

7.5

1992

8.1

1993

7.3

2006

6.8

1999

6.6

1994

8.4

1992

5.7