1999

7.0

2001

8.4

2002

8.4

2003

8.5

1995

5.9

1998

4.4

1982

6.8

2008

6.3

1979

7.2

2013

8.3

1992

7.7

1983

6.1

2006

5.1

1966

6.4

1993

6.5

1984

6.1

2000

6.4

1990

6.2

1996

6.5

1997

7.6