2002

7.5

1996

7.6

1996

8.0

1997

7.1

1999

7.0

1984

7.5

2003

7.6

1999

7.6

1981

6.9

2015

7.7

2008

7.6

1985

7.6

1969

7.8

2017

8.1

1983

8.0

2005

8.6

1995

6.4

1988

7.6

2009

7.4

2010

8.5