1989

8.0

2009

7.9

2009

7.6

1991

7.8

2002

6.5

1996

7.0

1997

7.3

1969

6.7

1998

7.1

2015

8.0

2013

6.0

2013

8.0

2008

5.0

0.0

1995

7.6

1994

7.5

1978

7.1

2005

6.9

2004

4.2

2007

5.1