1994

8.5

2010

5.9

2009

7.8

1987

5.3

2003

5.9

1992

5.8

1996

6.4

1994

4.5

2002

6.3

1988

5.0

1962

7.7

2003

7.2

1997

6.7

1994

7.5

1993

7.4

1987

7.6

2006

7.7

2000

7.5

1999

7.1

2013

6.0