1986

6.0

1999

5.7

1979

6.5

1997

8.6

2002

7.5

2000

8.5

2001

7.3

1981

6.7

1983

5.0

1976

7.5

2006

6.9

2019

7.4

2013

7.0

2005

10.0

1993

7.1

1990

6.9

2004

8.2

1993

7.0

1998

7.0

1989

6.6